Complex sentence: Calvert moved to England when he was two years of age, and after schooling in London and Margate, began his career by writing poetry and in 1967 formed a Street Theatre group "Street Dada Nihilismus".
Split into simpler sentences: Calvert moved to England when he was two years of age and attended school in London and Margate. He began his career by writing poetry and in 1967 formed a Street Theatre group "Street Dada Nihilismus".