Complex sentence: The student population began to dwindle in the 2000s and now stands at only 549 (2012-13) students due to the students chose to go other schools in the area such as Neil McNeil, Notre Dame, Danforth, and Malvern.
Split into simpler sentences: The student population began to dwindle in the 2000s and now stands at only 549 (2012-13) students. Students chose to go to other schools in the area such as Neil McNeil, Notre Dame, Danforth, and Malvern.