In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
Q: Littlehampton is a seaside town in Arun , West Sussex , England .
A: 
Littlehampton is a town , seaside resort and pleasure harbour , and the most populous civil parish in the Arun District of West Sussex , England .