Complex sentence: On 6 March, the Italian government was asked to restore order and Italian troops entered the city on 17 March who returned control to the minority of the constituent assembly, loyal to the Italian annexationists.
Split into simpler sentences: On 6 March, the Italian government was asked to restore order and Italian troops entered the city on 17 March. They returned control to the minority of the constituent assembly, who were loyal to the Italian annexationists.