Complex sentence: After Hall's death in 1870, the dogs became available beyond the Hall family and their associates, and were subsequently developed into two modern breeds, the Australian Cattle Dog and the Australian Stumpy Tail Cattle Dog.
Split into simpler sentences: After Hall's death in 1870, the dogs became available beyond the Hall family and their associates. They were subsequently developed into two modern breeds: the Australian Cattle Dog and the Australian Stumpy Tail Cattle Dog.