Complex sentence: He was bred at E. P. Taylor's Windfields Farm in Oshawa, Ontario, Canada and was by the hugely successful sire Northern Dancer his dam was the good brood mare, Flaming Page (who won the Queen's Plate) by Bull Page.
Split into simpler sentences: He was bred at E. P. Taylor's Windfields Farm in Oshawa, Ontario, Canada and was by the hugely successful sire Northern Dancer. His dam was the good brood mare, Flaming Page (who won the Queen's Plate) by Bull Page.