Original: It was with the 'Young Contemporaries' exhibition of 1961 where he was exhibited alongside David Hockney and R.B. Kitaj that he was first identified with the emerging British Pop Art movement.
Simplified: It was the 'Young Contemporaries' exposition of 1961 where he was displayed next to David Hockney and R.b Kitaj that he was first identified with the young British Pop Art movement.