Complex sentence: Justicialists have, covering nearly the entire period since 1989, been the largest party in the Argentine Congress, and currently hold 122 of 257 members in the Argentine Chamber of Deputies, and 43 of 72 seats in the Argentine Senate.
Split into simpler sentences: Justicialists have, covering nearly the entire period since 1989, been the largest party in the Argentine Congress. Justicialists currently hold 122 of 257 members in the Argentine Chamber of Deputies, and 43 of 72 seats in the Argentine Senate.