Complex sentence: On November 25,2009, a referendum was held in which voters were asked to approve a new constitution, which would make the country a republic, replacing Queen Elizabeth II as head of state with a non-executive President.
Split into simpler sentences: On November 25,2009, voters were asked to approve a new constitution in a referendum. The new constitution proposed to make the country a republic and replacing Queen Elizabeth II as head of state with a non-executive President.