Complex sentence: The Armed Forces Delegation for Poland was established instead in May, to be finally replaced by the Freedom and Independence (WiN) formation, whose goal was to organize political rather that military resistance to the communist domination.
Split into simpler sentences: The Armed Forces Delegation for Poland was established instead in May. It was finally replaced by the Freedom and Independence (WiN) formation, whose goal was to organize political rather that military resistance to the communist domination.