Complex sentence: Hornell was born in the Toronto suburb of Mimico where he attended Mimico High School obtaining the Fred Werden scholarship given in memory of the son of Mimico's Postmaster who was killed in the First World War.
Split into simpler sentences: Hornell was born in the Toronto suburb of Mimico. He attended Mimico High School, having obtained the Fred Werden scholarship, given in memory of the son of Mimico's postmaster, who was killed in the First World War.