Before revision:  Time series extracted from a massive corpus of books (6) reveal that this regulation in fact produced a  renewed interest for the old form -se that eventually faded, leaving -ra again as the dominant one in the present day.
After revision:  Time series extracted from a massive corpus of books (6) reveal that this regulation in fact produced a renewed interest for the old form -se which, once faded, left the -ra again as the dominant one in the present day.