Complex sentence: As a result the head of the school Mr. Evans stepped down and released a statement calling for action against this transgression, furthermore the guard staff were replaced and security was tightned with a CCTV system installed throughout the school grounds.
Split into simpler sentences: As a result the head of the school Mr. Evans stepped down and released a statement calling for action against this transgression. Furthermore the guard staff were replaced and security was tightned with a CCTV system installed throughout the school grounds.