Complex sentence: Westerford's principal at the time Rob le Roux became the temporary principal of Claremont High during its opening year and many of Westerford High Schools teaching staff were part of Claremont High's first teaching staff.
Split into simpler sentences: Westerford's principal at the time, Rob le Roux, became the temporary principal of Claremont High during its opening year. Many of Westerford High Schools teaching staff were part of Claremont High's first teaching staff.