Complex sentence: The Mosul University Library System is currently in tatters after the invasion of Iraq in March 2003, most of the books where taken by librarians to their homes in protection from the looting that took place, that were eventually returned to the library.
Split into simpler sentences: The Mosul University Library System is currently in tatters after the invasion of Iraq in March 2003. Many of the books where taken by librarians to their homes to protect them from the looting that took place, and these were eventually returned to the library.