Complex sentence: Morton was also noticed by AR Rahman (composer for "Slumdog Millionaire"), who asked Morton to contribute "Sajna" to the soundtrack and movie for the Vince Vaughn comedy "Couples Retreat".
Split into simpler sentences: Morton was also noticed by AR Rahman (who had composed "Slumdog Millionaire"). Rahman asked Morton to contribute "Sajna" to the soundtrack and movie for the Vince Vaughn comedy "Couples Retreat".