Complex sentence: King James fled the country December 23 and on February 1689, the English Parliament declaring that, by fleeing, James had abdicated, offered the throne jointly to William and Mary, the Protestant daughter of James to whom William owed his claim to the throne.
Split into simpler sentences: King James fled the country December 23 and, on February 1689, the English Parliament declaring that, by fleeing, James had abdicated. Parliament then offered the throne jointly to William and Mary, the Protestant daughter of James to whom William owed his claim to the throne.