Complex sentence: We learn as the episode continues that Patrick was 20 years old when he left her, and was also an alcoholic at the time.It's not 100% clear why Patrick is now trying to get back into Sam's life.
Split into simpler sentences: We learn as the episode continues that Patrick was 20 years old when he left her, and was also an alcoholic at the time. At first, it was not 100% clear why Patrick was trying to get back into Sam's life.