Complex sentence: Kadan in charge of tracking King Bela IV is troubled to proceed with a smaller force decides to came in contact with Batu who agreed to give half of his forces to Kadan and another half to target Esztergom.
Split into simpler sentences: Kadan in charge of tracking King Bela IV came contact with Batu who is troubled proceeding to chase after King Bela IV with a smaller force. Batu divided his forces gave half to Kadan and another half to target Esztergom.