Complex sentence: The farmland is mainly used for cattle (both dairy and beef) and a small amount of arable (mainly potatos and barley) and in summer a number of poly-tunnels produce a crop of strawberries.
Split into simpler sentences: The farmland is mainly used for cattle (both dairy and beef) and a small amount of arable (mainly potatos and barley). In summer a number of poly-tunnels produce a crop of strawberries.