Complex sentence: He followed his father into flying, with an early career as a test pilot for jet fighters, then qualified as a barrister, playing a minor role in the Nurenburg War Crimes trials, before deciding his future did not lie in law.
Split into simpler sentences: He followed his father into flying with an early career as a test pilot for jet fighters. He then qualified as a barrister, playing a minor role in the Nurenburg War Crimes trials, before deciding his future did not lie in law.