Complex sentence: Baynes was educated at Gresham's School, leaving school at the age of sixteen to start work in the fledgling aircraft industry with the "Aircraft Engineering Company" at Hendon.
Split into simpler sentences: Baynes was educated at Gresham's School, leaving school at the age of sixteen. On leaving school, Baynes started work in the fledgling aircraft industry with the "Aircraft Engineering Company" at Hendon.