21st Anniversary: I Guess This Is Growing Up Possible typo, but my english might not be good enough. Might be: This being that has was wholly depended upon them is now able to make decisions on their own.
I don't think "was" would be correct in this sentence. If "depended" were changed to "dependent," then "was" definitely works. But "has" should probably be changed to "had" to match the context of the sentence (if the word "depended" remains unchanged).