Complex sentence: The spire of the tower is fitted with a neon light in the form of a cross, which is used by ships to navigate safely through the Levuka Passage to the port; this light works in synchronization with another green light fitted on the hill.
Split into simpler sentences: The spire of the tower is fitted with a neon light in the form of a cross, which is used by ships to navigate safely through the Levuka Passage to the port. This light works in synchronization with another green light fitted on the hill.