Need to make an array in an array

hi, I’m trying to make a thing that has two arrays in an array, but there is one problem, I do not know how to use one of the arrays that is inside the other array. here’s my code!

[System.Serializable]
public class OneSet
{
public string NamesToBeFound;
public GameObject ObjectsToTrigger;
public bool StartOff;
}

public OneSet[][] Set;


// Start is called before the first frame update
void Start()
{
    if (StartOff == true)
    {
        foreach (var Object in Set)
        {
            foreach (var GameObject in Object.ObjectsToTrigger)
            {
                GameObject.gameObject.SetActive(false);
            }
        }
    }
    else
    {
        foreach (var Object in Set)
        {
            foreach (var GameObject in Object.ObjectsToTrigger)
            {
                GameObject.gameObject.SetActive(true);
            }
        }
    }
}

and it is in a larger none Serialized class

Thanks for any help;-)

Whoops, did not put all the scripts in!
Here they are.

all the words are below are part of the code—————————————————————————

[System.Serializable]
public class OneSet
{
public string NamesToBeFound;
public GameObject ObjectsToTrigger;
public bool StartOff;
}

public OneSet[][] Set;


// Start is called before the first frame update
void Start()
{
    if (StartOff == true)
    {
        foreach (var Object in Set)
        {
            foreach (var GameObject in Object.ObjectsToTrigger)
            {
                GameObject.gameObject.SetActive(false);
            }
        }
    }
    else
    {
        foreach (var Object in Set)
        {
            foreach (var GameObject in Object.ObjectsToTrigger)
            {
                GameObject.gameObject.SetActive(true);
            }
        }
    }
}

It seems it is possible, here was a post that was answered pretty detailed on the matter : Array of Arrays - Questions & Answers - Unity Discussions

But I must say that there are better ways, of doing what you are asking for(in general). One example being that of your array holder just being a parent class, and holding a List of it’s children, and a function within it to disable or re-enable them when called.