error cs1002 but if i correct it, it screws up.

So, im getting this error message:
Assets\PlayerMovement.cs(56,21): error CS1002: ; expected
but if i put a ; where it wants i get a whole lot of other error messages, and now im wondering what im supposed to do.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PlayerMovement : MonoBehaviour
{

    public float Speed;
    public float JumpPower;

    private Rigidbody2D RB;

    private float _startJumpPower;


    // Start is called before the first frame update
    void Start()
    {

        RB = GetComponent<Rigidbody2D>();
        _startJumpPower = JumpPower;
    }

    // Update is called once per frame
    void Update()
    {

        Vector2 movement = new Vector2(0, RB.velocity.y);

        if (Input.GetKey(KeyCode.A))
        {
            movement.x = -Speed*Time.deltaTime;
        }
        else if (Input.GetKey(KeyCode.D))
        {
            movement.x = Speed*Time.deltaTime;
        }

        RB.velocity = movement;

        if (Input.GetKeyDown(KeyCode.Space))
        {
            RB.AddForce(new Vector2(0, JumpPower));
        }
    }

    public void JumpPowerUp(float seconds, float jumpPower)
    {
        StartCoroutine(RunJumpPowerUP(seconds, JumpPower));
    }


    IEnumerator RunJumpPowerUP(float seconds, float jumpPower)
    {
        JumpPower = jumpPower;
        yield retun new WaitForSeconds(seconds);
        JumpPower = _startJumpPower;
    }



}

How to understand compiler and other errors and even fix them yourself:

https://discussions.unity.com/t/824586/8

How to report your problem productively in the Unity3D forums:

http://plbm.com/?p=220

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How to use code tags: https://discussions.unity.com/t/481379

On line 56 (which I’m assuming based on what you have shown in your script that you have already added the ; at the end) you have put yield retun when it should be yield return
Spelling matters when coding.

Thanks i didn’t notice that