Complex sentence: Chalmers was initially disappointed to find the island partially Christianized, but soon found there was much work to be done in fighting drunkenness and in directing the natives' energies into wiser practices.
Split into simpler sentences: Chalmers was initially disappointed to find the island partially Christianized, but soon found there was much work to be done. There was much work to be done in fighting drunkenness and in directing the natives' energies into wiser practices.