Complex sentence: It is notable that during the 1985-86 season, Mostar was a town of 100,000 people, however, 8,000 Red Army members traveled to Split to watch the Velež-Hajduk match.
Split into simpler sentences: It is notable that during the 1985-86 season Mostar was a town of 100,000 people. However 8,000 Red Army members traveled to Split to watch the Velež-Hajduk match.