Complex sentence: In the mid- 1960s a then-average-sized A&P Supermarket was built, though during the late 1990s, A&P closed this original store and built a supermarket a few miles away from the town center, next door to their former store.
Split into simpler sentences: In the mid- 1960s a then-average-sized A&P Supermarket was built. During the late 1990s, A&P closed this original store and built a supermarket a few miles away from the town center, next door to their former store.