Different tax computation for different employments in the year of assessment

I am wondering if we have to do a separate computation if the individual has 2 different employments in a single year of assessment? For example, an individual commenced employment with MK on Jul 1, 2011, and his employment was terminated on May 31, 2014. On Aug 1, 2014, he joined SC as a plant manager. So how does the computation work for the year of assessment 2014? Or do I just have to include everything under S.13(1)(a)? Thank you.