Complex sentence: The current building is the third station to be built in Polegate on the site of the original station and was completed in 1986 by Network Southeast, and officially opened by Ian Gow in 1987.
Split into simpler sentences: The current building is the third station to be built in Polegate and is on the site of the original station. It was completed in 1986 by Network Southeast, and officially opened by Ian Gow in 1987.