Complex sentence: In 2008-9, the priority campaign of the Union was to save the on-campus nursery from closure, and in 2009-10 it campaigned to force LSE to allow students to have resits in their examinations.
Split into simpler sentences: In 2008-9 the priority campaign of the Union was to save the on-campus nursery from closure. In 2009-10 the Union lobbied LSE to allow students to have resits in their examinations.