Complex sentence: Morang and Limbuwan already had good relations with the Kingdom of Purnea in the south and he also developed good relations with King Ranjit Malla of Bhaktapur.
Split into simpler sentences: Morang and Limbuwan also already had good relations with Kingdom of Purnea in the south. He also develops good relations with King Ranjit Malla of Bhaktapur.