Complex sentence: Culavamsa, Chapter LXIII, 23 Gajabahu established himself firmly as ruler and therefore nominally senior to the two Arya kings Culavamsa, Chapter LXIII, 23 and neither Sri Vallabha nor Kitti Sri Megha would lived to see the king of Rajarata dethroned.
Split into simpler sentences: Culavamsa, Chapter LXIII, 23 Gajabahu established himself firmly as ruler and therefore nominally senior to the two Arya kings. Neither Sri Vallabha nor Kitti Sri Megha lived to see the king of Rajarata dethroned.