HI, I've got a question and I hope you can help me.

I've found a sentence on the Internet:

He is a writer fallen into oblivion.

usually I'll write sth in this way:

He is a writer who has fallen into oblivion.

And we know that in a sentence, WHO IS etc (but not WHO HAS/HAVE etc) can be left out.

what I've learned is that in early modern English, WHO IS (IS as an auxiliary verb) could be replaced by WHO HAS; but could WHO HAS be used in ellipsis?(just as the first sentence I have quoted?)