Complex sentence: Harper-Mercer lived with his mother in Torrance, California, from 2011 to 2013 and was a graduate of Switzer Learning Center, a school for teenagers with learning disabilities or emotional issues.
Split into simpler sentences: Harper-Mercer lived with his mother in Torrance, California, from 2011 to 2013. He was a graduate of Switzer Learning Center, a school for teenagers with learning disabilities or emotional issues.