Complex sentence: Although the Prime Minister is consider the head of government, the formal Italian order of precedence lists the office as being ceremonially the fourth most important Italian state office, it's also considered the de facto leader of the Italian government.
Split into simpler sentences: Although the Prime Minister is considered the head of government, the formal Italian order of precedence lists the office as being ceremonially the fourth most important Italian state office. It also is considered the de facto leader of the Italian government.