Complex sentence: According to the "New York Times", law enforcement officials commented that Adam Lanza would spend most of his time in his basement doing solitary activities, some of which include playing video games, one of which was the warfare game "Call of Duty".
Split into simpler sentences: According to the "New York Times", law enforcement officials commented that Adam Lanza would spend most of his time in his basement doing solitary activities. Some of which include playing video games, one of which was the warfare game "Call of Duty".