Complex sentence: Although he featured in 42 matches--five fewer matches than in the previous season--his goal count was much improved: he scored 12 goals in total, all of which came in the Eredivisie.
Split into simpler sentences: Although he featured in 42 matches--five fewer matches than in the previous season, his goal count was much improved. He scored 12 goals in total, all of which came in the Eredivisie.