Complex sentence: His brother, Thaniya-Vallabha, was the viceroy of Katupiti Madampe with his four step brothers, Dharma Parakramabahu, Vijayaratne, Rajasingha and Raigam Bandara.
Split into simpler sentences: His brother, Thaniya-Vallabha, was the viceroy of Katupiti Madampe. He had four step brothers, Dharma Parakramabahu, Vijayaratne, Rajasingha and Raigam Bandara.