Complex sentence: With the out set of the Sri Lankan Civil War and the insurrection 1987-89 he raised and commanded the 24 Brigade and thereafter was appointed brigade commander of the 21 brigade based out of Jaffna, before becoming the Commander, Security Forces, Jaffna.
Split into simpler sentences: With the out set of the Sri Lankan Civil War and the insurrection 1987-89 he raised and commanded the 24 Brigade. Soon thereafter he was appointed brigade commander of the 21 brigade based out of Jaffna, before becoming the Commander, Security Forces, Jaffna.