Complex sentence: Later he travelled to Egypt where he trained to be a pilot, before he was posted to France with 56 Squadron, serving with aces James McCudden, Arthur Rhys Davids and Keith Muspratt.
Split into simpler sentences: Later he travelled to Egypt where he trained to be a pilot, before he was posted to France with 56 Squadron. There he served with James McCudden, Arthur Rhys Davids and Keith Muspratt.