Complex sentence: Angus began his career as community activist in Toronto, and as a musician in the punk rock band L'Étranger (with Andrew Cash), and later in the more folk-oriented Grievous Angels.
Split into simpler sentences: Angus began his career as community activist in Toronto. He was also a musician in the punk rock band L'Étranger with Andrew Cash, and later in the more folk-oriented Grievous Angels.