Complex sentence: It is based on a story by Sam Jones, directed by Marc Lloyd and starred Meredydd Evans, Ieuan Rhys Williams, Nellie Hodgkins and Robert Roberts as the main roles respectively.
Split into simpler sentences: It is based on a story by Sam Jones, directed by Marc Lloyd. It starred Meredydd Evans, Ieuan Rhys Williams, Nellie Hodgkins and Robert Roberts as the main roles respectively.