Complex sentence: In 1791 the parish school was situated near the cross, a new parish school was opened in 1864 as a single-storey building, and may be seen somewhat altered on the opposite side of the main street.
Split into simpler sentences: In 1791 the parish school was situated near the cross. A new parish school was opened in 1864 as a single-storey building and may be seen, somewhat altered, on the opposite side of the main street.