Complex sentence: It has served the rural parish, northwest of Shoreham-by-Sea and next to the River Adur, since the 11th century; despite several rebuildings, some structural elements remain from that period.
Split into simpler sentences: It has served the rural parish, northwest of Shoreham-by-Sea and next to the River Adur, since the 11th century. Despite several rebuildings, some structural elements remain from that period.