Complex sentence: Initially trained as a teacher, and working in this profession (teaching chemistry) and as a photographer, he subsequently took a BSc in psychology at Birkbeck College, London University, graduating with first class honours, and deciding to work in genetics.
Split into simpler sentences: Initially trained as a teacher, and working in this profession (teaching chemistry) and as a photographer. He subsequently took a BSc in psychology at Birkbeck College, London University, graduating with first class honours, and deciding to work in genetics.