Spawner1.cs

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

public class Spawner1 : MonoBehaviour
{
    //spawner from spaceshooter

    public GameObject hazard;
    public int hazardCount;
    public float spawnWait;
    public float startWait;
    public float waveWait;
    public Transform spawnhere;

    //start the courotine right away
    void Start()
    {
        StartCoroutine(SpawnWaves());
    }

    //start spawning
    IEnumerator SpawnWaves()
    {
        yield return new WaitForSeconds(startWait);

        while (true)
        {
            //setup to handle multiple enemies
            for (int i = 0; i < hazardCount; i++)
            {
                //First Enemy
                if( i == 0)
                {
                    Quaternion spawnRotation = Quaternion.identity;
                    yield return new WaitForSeconds(spawnWait);
                    Instantiate(hazard, spawnhere.position, spawnRotation);
                }
                //Second Enemy
                if (i == 1)
                {
                    Quaternion spawnRotation = Quaternion.identity;
                    Instantiate(hazard, spawnhere.position, spawnRotation);
                    yield return new WaitForSeconds(spawnWait);
                }

                if (i == 2)
                {
                    Quaternion spawnRotation = Quaternion.identity;
                    Instantiate(hazard, spawnhere.position, spawnRotation);
                    yield return new WaitForSeconds(spawnWait);
                }
            }
            yield return new WaitForSeconds(waveWait);
        }
    }

}