Complex sentence: This period was known as the Protectorate, or to monarchists as the interregnum, as the monarchies were restored in 1660, with Scotland reverting back to an independent kingdom sharing the same monarch as England and Ireland.
Split into simpler sentences: This period was known as the Protectorate, or to monarchists as the interregnum. The monarchies were subsequently restored in 1660, with Scotland reverting back to an independent kingdom sharing the same monarch as England and Ireland.