Complex sentence: Polish factions, which gained control over the parliament (Sejm) of the Republic, on February 20 passed the request of incorporation into Poland had been passed, accepted by Polish Sejm on March 22,1922.
Split into simpler sentences: Polish factions, which gained control over the parliament (Sejm) of the Republic, on February 20 passed the request of incorporation into Poland. The request was accepted by Polish Sejm on March 22,1922.