Complex sentence: Also, Meri and Ifor have a baby in the film, as there is no play in the film, she has no reason to be in the school, and babysitting seems a good excuse for Martha to spend time around the family.
Split into simpler sentences: Also, Meri and Ifor have a baby in the film. As there is no play in the film, she has no reason to be in the school, and babysitting seems a good excuse for Martha to spend time around the family.