Complex sentence: O'Connor was signed by Pete Mahon for St. Patrick's Athletic midway through the 2011 season and scored on his first game back at the club against UCD on the 7th of August 2011 at Richmond Park.
Split into simpler sentences: O'Connor was signed by Pete Mahon for St. Patrick's Athletic midway through the 2011 season. He scored on his first game back at the club against UCD on the 7th of August 2011 at Richmond Park.