Complex sentence: The film wasn't as successful as its predecessor "Days of Future Past" but it still got to be the third highest grossing "X-Men" film worldwide and topped the foreign box office for three weeks in a row.
Split into simpler sentences: The film wasn't as successful as its predecessor "Days of Future Past" but it still got to be the third highest grossing X-Men film worldwide. And it topped the foreign box office for three weeks in a row.