Complex sentence: Even though Alaska Fairbanks had a record of 4-23 the season before Oleson arrived at the school, in the three seasons that Oleson played with Fairbanks, the school's record was 64-24.
Split into simpler sentences: Even though Alaska Fairbanks had a record of 4-23 the season before Oleson arrived at the school. In the three seasons that Oleson played with Fairbanks, the school's record was 64-24.