Complex sentence: Hicetas, learning that the general was advancing to occupy Adranum, hastened thither to anticipate him, but was defeated with heavy loss; and shortly afterwards Dionysius surrendered the citadel into the hands of the Corinthian leader.
Split into simpler sentences: Hicetas, learning that the general was advancing to occupy Adranum, led his forces there in anticipation of his arrival. However, Hicetas was defeated with heavy losses and, shortly afterwards, Dionysius surrendered the citadel into the hands of the Corinthian leader.