Complex sentence: During season five, Callie's parents expose Hunter's HIV status to the school at-large during a swim meet when he accidentally cuts his forehead and bleeds into the water, which makes Hunter a target for bullying and hatred at school.
Split into simpler sentences: During season five, Callie's parents also expose Hunter's HIV status at a swim meet after he has an accident, cuts his forehead open and bleeds into the water. This makes Hunter a target for bullying and hatred at school.