Complex sentence: His homosexuality was well known in acting circles, where he was known as Petunia Winegum, because of a ten-year-long relationship he had from 1956 with fellow actor Alan Bates.
Split into simpler sentences: His homosexuality was well known in acting circles, where he was known as Petunia Winegum. He had a ten-year-long relationship from 1956 with fellow actor Alan Bates.