Complex sentence: The winter of 397 BC was spent in small skirmishes, and in the Spring of 396 BC The Carthaginians captured the unwalled suburbs of the city and destroyed the temple of Demeter.
Split into simpler sentences: The winter of 397 BC was spent in small skirmishes. In the spring of 396 BC, the Carthaginians captured the areas of the city not protected by walls and destroyed the temple of Demeter.