Complex sentence: The following year a stone tower was erected; this was rebuilt somewhat in 1818, increasing the height of the tower; various upgrades to the tower were performed over the years including new lamps and an octagonal lantern.
Split into simpler sentences: The following year a stone tower was erected; this was rebuilt somewhat in 1818, increasing the height of the tower. Various upgrades to the tower were performed over the years including new lamps and an octagonal lantern.