Complex sentence: The original two-story building on the site was built in the late 1700s or early 1800s and served as a general store and post office, was also used for a time as a theater and later a movie house.
Split into simpler sentences: The original two-story building on the site was built in the late 1700s or early 1800s. It served as a general store and post office, and was used for a time as a theater and later a movie house.