Complex sentence: Included in the training was marine training, parachuting, hand-to-hand combat and military topography they additionally trained as company commanders so they could train and lead new recruits upon their return to South West Africa.
Split into simpler sentences: Included in the training was marine training, parachuting, hand-to-hand combat and military topography. They additionally trained as company commanders so they could train and lead new recruits upon their return to South West Africa.