Complex sentence: The primary school has been through 3 different headmasters in the last half-decade, this, and the Ma On Shan move has induced chaos and caused many teachers who have been at the school for the past two decades to leave.
Split into simpler sentences: The primary school has been through three different headmasters in the last half-decade. This, and the Ma On Shan move, has induced chaos and caused many teachers who have been at the school for the past two decades to leave.