Complex sentence: Melling is the grandson of Patrick Troughton, best known as the Second Doctor in the science fiction series "Doctor Who", thus nephew of distinguished siblings David Troughton and Michael Troughton, and the first cousin of Jim Troughton and Sam Troughton.
Split into simpler sentences: Melling is the grandson of Patrick Troughton, best known as the Second Doctor in the science fiction series "Doctor Who". He is the nephew of David Troughton and Michael Troughton, and the first cousin of Jim Troughton and Sam Troughton.