Complex sentence: He also suffers an ironic comeuppance from a dentist he has cuckolded; the dentist offers Gowan free dental care as a ruse for ruining his smile and forcing him to wear dentures.
Split into simpler sentences: He also suffers an ironic comeuppance from a dentist he has cuckolded. The man offers Gowan free dental care as a ruse for ruining his smile and forcing him to wear dentures.