Complex sentence: Boronia K-12 College, established in 2012 merging with Boronia Primary School, Allendale Kindergarten and Boronia Heights College on Boronia Primary School's campus, running concurrently as the Rangeview Campus, until the Mountview Campus (Boronia Heights College) closed in 2014.
Split into simpler sentences: Boronia K-12 College, established in 2012 merged with Boronia Primary School, Allendale Kindergarten and Boronia Heights College on Boronia Primary School's campus. It ran concurrently as the Rangeview Campus, until the Mountview Campus (Boronia Heights College) closed in 2014.