Complex sentence: Thompson made his debut for Linfield in the 2001--02 season as a substitute, however the following season, he started 6 games and appeared as a sub on a further 9 occasions, scoring twice.
Split into simpler sentences: Thompson made his debut for Linfield in the 2001--02 season as a substitute. However, the following season he started 6 games and appeared as a sub on a further 9 occasions, scoring twice.