Complex sentence: Lira was the main town of the now defunct Lango District (which corresponds geographically with the current Lango sub-region) that was split into Lira District and Apac District in 1974, and subsequently into the districts of Amolatar, Apac, Dokolo, Lira and Oyam.
Split into simpler sentences: Lira was the main town of the now defunct Lango District (which corresponds geographically with the current Lango sub-region) that was split into Lira District and Apac District in 1974. Subsequently, the sub-region was divided into the districts of Amolatar, Apac, Dokolo, Lira and Oyam.