Complex sentence: At which point Ian transferred to the public school system and attended John G. Althouse Middle School for the gifted enrichment program until grade 7 at which point Ian attended Bloordale Middle school for his final 2 years of school before entering high school.
Split into simpler sentences: At which point he transferred to the public school system and attended John G. Althouse Middle School for the gifted enrichment program until grade 7. Ian then attended Bloordale Middle school for his final 2 years of middle school before entering high school.