Complex sentence: Kossoff started playing guitar in the mid 1960s, taught by session guitarist Colin Falconer, Paul became a professional at age 15 when he was a founding member of Black Cat Bones.
Split into simpler sentences: Kossoff started playing guitar in the mid 1960s, taught by session guitarist Colin Falconer. He became a professional at age 15 when he was a founding member of Black Cat Bones.