Complex sentence: The British Post Office offered a generous parachute clause to engineering recruits to Australia: if the new position in Australia was not satisfactory, recruits could return to BPO's employment without penalty within three years.
Split into simpler sentences: The British Post Office offered a generous parachute clause to engineering recruits to Australia. If the new position in Australia was not satisfactory, recruits could return to BPO's employment without penalty within three years.