Complex sentence: MacCorkindale spent much of childhood in changing locations due to his father's membership of the Royal Air Force; poor eyesight prevented him from following his father's footsteps and so he planned to be a theatre director instead.
Split into simpler sentences: MacCorkindale spent much of childhood moving around due to his father being in the Royal Air Force. Poor eyesight prevented him from following his father's footsteps and so he planned to be a theatre director instead.