Complex sentence: A new state secondary school is planned for the Rototuna area to serve the booming north-eastern corner of the city, having been delayed several years as the current secondary school serving the area, Fairfield College, is below capacity.
Split into simpler sentences: A new state secondary school is planned for the Rototuna area to serve the booming north-eastern corner of the city. The project had been delayed several years as the current secondary school serving the area, Fairfield College, is below capacity.