Complex sentence: Shep (1971--1987), a border collie, is widely considered to be the most famous "Blue Peter" pet; he was bought by the BBC to replace Patch, one of Petra's puppies, born in 1965.
Split into simpler sentences: Shep (1971--1987), a border collie, is widely considered to be the most famous "Blue Peter" pet. Shep was bought by the BBC to replace Patch, one of Petra's puppies, born in 1965.