Complex sentence: All Polish units under British command-over 240,000 soldiers-could be sent into action at any part of the Western front, the 1st Polish Independent Parachute Brigade would fight for Poland on Polish territory.
Split into simpler sentences: All Polish units under British command (over 240,000 soldiers) could be sent into action at any part of the Western front. The 1st Polish Independent Parachute Brigade would fight for Poland on Polish territory.