Complex sentence: He served in that capacity till May 2012 when Mallam Abdullahi was appointed Minister of Sports and he became Special Assistant to the Minister on Youth, School and Grassroots Sports till March 2014.
Split into simpler sentences: He served in that capacity till May 2012 when Mallam Abdullahi was appointed Minister of Sports. In the Sports Ministry, he was saddled with a new assignment as Special Assistant to the Minister on Youth, School and Grassroots Sports till March 2014.