Complex sentence: His older brother, Dustin, played defensive back at BYU in 1995, then served an LDS mission, then returned to BYU and was a teammate of his brother from 1999 to 2001.
Split into simpler sentences: His older brother, Dustin, played defensive back at BYU in 1995 and then served an LDS mission. Dustin returned to BYU and was Luke's teammate from 1999 to 2001.