Complex sentence: Trackstar began his DJ career at KWUR 90.3FM at Washington University in St. Louis in 1999, and appeared monthly on Sirius XM Hip Hop Nation with his RMF Radio segment on DJ Jamad's Afromentals from April 2009 to January 2010.
Split into simpler sentences: Trackstar began his DJ career at KWUR 90.3FM at Washington University in St. Louis in 1999. More recently he appeared monthly on Sirius XM Hip Hop Nation with his RMF Radio segment on DJ Jamad's Afromentals from April 2009 to January 2010.