Complex sentence: He retired from commercial singing on 17 March 2010 to concentrate on his political career, but he returned to commercial singing with the solo album titled "X-Prem" in August 2013.
Split into simpler sentences: He retired from commercial singing on 17 March 2010 to concentrate on his political career. But he returned to commercial singing with the solo album titled "X-Prem" in August 2013.