Complex sentence: In his first season, the club finished 15th (second-last), though there was some slight improvement in his second season, in which Fremantle won several high-profile games; still, the club struggled, and finished twelfth.
Split into simpler sentences: In his first season, the club finished 15th (second-last). Though there was some slight improvement in his second season, in which Fremantle won several high-profile games, the club nevertheless struggled, and finished twelfth.