Complex sentence: On the following day at 7:15 a.m., Borel arrived at the home of his friend Alan Guillemette and when Alan's mother opened the door Eric asked her to wake him.
Split into simpler sentences: On the following day at 7:15 a.m., Borel arrived at the home of his friend Alan Guillemette. When Guillemette's mother opened the door Eric asked her to wake him.