Complex sentence: After discovering her father's infidelity, she sought and gained sanctuary at the vicarage, but in considering joining the RAF; by whom she was recently accepted to train at RAF Cranwell; she came into conflict with Amy's pacifist views.
Split into simpler sentences: After discovering her father's infidelity, she sought and gained sanctuary at the vicarage. In considering joining the RAF, by whom she was recently accepted to train at RAF Cranwell, she came into conflict with Amy's pacifist views.