Simplify the following text for a Grade 8 native English-speaking person.
Original: The result of a few months spent near London was a series of nearly twenty paintings of the Upper Thames near Molesey , which was later described by art historian Kenneth Clark as `` a perfect moment of Impressionism . ''
Simplified: The result of the trip was a series of nearly 20 paintings of the Upper Thames near Molesey . Art historian Kenneth Clark said this was `` a perfect moment of Impressionism . ''