Complex sentence: The group is made up of ten stars from 5th to 7th magnitude which form the striking Coathanger asterism, and an additional thirty or so fainter stars are sometimes considered to be included as well.
Split into simpler sentences: The group is made up of ten stars ranging from 5th to 7th magnitude which form the striking Coathanger asterism. An additional thirty or so fainter stars are sometimes considered to be included as well.