Complex sentence: In 1970, Adamson University reapplied for admission to the league with a two-year probationary period and in 1974, Adamson successfully hosted the 1974--1975 athletic season paving the way for its permanent membership into the league.
Split into simpler sentences: In 1970, Adamson University reapplied for admission to the league with a two-year probationary period. In 1974, Adamson successfully hosted the 1974--1975 athletic season paving the way for its permanent membership into the league.