respawn all after player die or doing checkpoint

Hello to everyone.I building a 2D game and i have a problem.I want that when the player make checkpoint and if he lose, all the moved objects would respawn in their starting locations(enemies,falling platforms.)How to do that?(My player make checkpoints but when i lose only the player respawn)Thank you very much

My player Script(also contain the checkpoint of the player)

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class PlayerController : MonoBehaviour
 {
 
 
     public Transform m_currMovingPlatform;
 
     public AudioClip impact;
     AudioSource audio;
     bool doubleJump = false;
     public float maxSpeed;
     public Vector3 respawnPoint;
 
     bool grounded = false;
     float groundCheckRadius = 0.2f;
     public LayerMask groundLayer;
     public Transform groundCheck;
     public float jumpHeight;
 
     Rigidbody2D myRB;
     Animator myAnim;
     bool facingRight;
 
     public Transform gunTip;
     public GameObject bullet;
     float fireRate = 0.5f;
     float nextFire = 0f;
 
     // Use this for initialization
     void Start ()
     {
 
         audio = GetComponent<AudioSource> ();
         myRB = GetComponent<Rigidbody2D> ();
         myAnim = GetComponent<Animator> ();
         respawnPoint = transform.position;
 
         facingRight = true;
 
     }
     
     // Update is called once per frame
 
     void Update ()
     {
         if ((grounded || !doubleJump) && Input.GetButtonDown ("Jump")) {
             //not on the ground
             myAnim.SetBool ("isGrounded", false);
             //add jump force to Y axis of the rigidbody
             myRB.velocity = new Vector2 (myRB.velocity.x, jumpHeight);
             transform.parent = null;
 
             if (!doubleJump && !grounded) {
                 doubleJump = true;
             }
         }
 
         // double jump reset   
         if (grounded) {
             doubleJump = false;
         }
 
         if (Input.GetAxisRaw ("Fire1") > 0)
             fireRocket ();
 
     }
 
 
 
     void FixedUpdate ()
     {
 
         grounded = Physics2D.OverlapCircle (groundCheck.position, groundCheckRadius, groundLayer);
         myAnim.SetBool ("isGrounded", grounded);
         myAnim.SetFloat ("VerticalSpeed", myRB.velocity.y);
 
         float move = Input.GetAxis ("Horizontal");
         myAnim.SetFloat ("speed", Mathf.Abs (move));
         myRB.velocity = new Vector2 (move * maxSpeed, myRB.velocity.y);
 
         if (move > 0 && !facingRight) {
             flip ();
         } else if (move < 0 && facingRight) {
             flip ();
         }
     }
 
     void OnCollisionEnter2D (Collision2D coll)
     {
         if (coll.gameObject.tag == "Platform") {
             m_currMovingPlatform = coll.gameObject.transform;
             transform.SetParent (m_currMovingPlatform);
         }
     }
 
     void OnCollisionExit2D (Collision2D coll)
     {
         if (coll.gameObject.tag == "Platform") {
             m_currMovingPlatform = null;
         }
     }
 
 
     void flip ()
     {
         facingRight = !facingRight;
         Vector3 theScale = transform.localScale;
         theScale.x *= -1;
         transform.localScale = theScale;  
     }
 
     void fireRocket ()
     {
         if (Time.time > nextFire) {
             nextFire = Time.time + fireRate;
             if (facingRight) {
                 Instantiate (bullet, gunTip.position, Quaternion.Euler (new Vector3 (0, 0, 0)));
             } else if (!facingRight) {
                 Instantiate (bullet, gunTip.position, Quaternion.Euler (new Vector3 (0, 0, 180f)));
             }
         }
     }
 
     void OnTriggerEnter2D (Collider2D other)
     {
         if (other.tag == "cleaner") {
             transform.position = respawnPoint;
         }
         if (other.tag == "Checkpoint") {
             respawnPoint = other.transform.position;
         }
         if (other.tag == "Coin")
             audio.PlayOneShot (impact, 0.7F);
             
 
     }
 
     void OnTriggerStay2D (Collider2D other)
     {
         if (other.tag == "Coin")
             Destroy (other.gameObject);
     }
 }