Complex sentence: As Christmas approaches, Linus goes to Janice's house to give her a present, but her sisters inform Linus that she is at the hospital receiving treatment, and explains that she is upset at all the attention Janice has been getting lately.
Split into simpler sentences: As Christmas approaches, Linus goes to Janice's house to give her a present, but her sisters inform Linus that she is at the hospital receiving treatment. The sisters are upset at all the attention Janice has been getting lately.