Complex sentence: Alhallows-on-Sea was planned as the best holiday resort in Europe, and was to have the largest swimming pool in the UK with the first artificial wave generator in Europe, and an amusement park four times the size of the Blackpool pleasure beach complex.
Split into simpler sentences: Alhallows-on-Sea was planned as the best holiday resort in Europe. Allhallows was to have the largest swimming pool in the UK with the first artificial wave generator in Europe, and an amusement park then four times the size of the Blackpool pleasure beach complex.