Complex sentence: Sonja Puzic and Alison Northcott: Sheldon was educated at Downsview Public and Secondary School, in Toronto he finally earned his master's degree in Mathematics from York University.
Split into simpler sentences: Sonja Puzic and Alison Northcott: Sheldon was educated at Downsview Public and Secondary School, in Toronto. He earned his master's degree in Mathematics from York University.