Complex sentence: Old Jock was bred from a black and tan terrier, while Trap was from the strain out of the dogs owned by Reverend John Russell and although definitive history on Tartar isn't known, he is also thought to have come from black and tan terrier stock.
Split into simpler sentences: Old Jock was bred from a black and tan terrier, while Trap was from the strain out of Reverend John Russell's dogs. Although definitive history on Tartar isn't known, he is also thought to have come from black and tan terrier stock.