Complex sentence: In the early 1950s, he appeared in several shows at Unity Theatre, London before reguarly appearing in British TV shows during the 1960s and 1970s such as "The Avengers", "The Saint", "Strange Report" and "Blake's 7".
Split into simpler sentences: In the early 1950s, he appeared in several shows at Unity Theatre, London. During the 1960s and 1970s, Glover frequently appeared in British television shows, including "The Avengers", "The Saint", "Strange Report" and "Blake's 7".