Complex sentence: In April 2011, they signed the American DJ and producer from Boston, Max Baun, the previous year, they signed the DJ and producer Brian Roche, from the same place and the Spanish chillout producer and artist Lounj Act.
Split into simpler sentences: In April 2011, they signed the American (Boston) DJ and producer Max Baun. In January 2010, they signed the American (Boston) DJ and producer Brian Roche, and the Spanish chillout producer and artist Lounj Act.