Complex sentence: Lödöse by the year 1000 was and important town for trade, located between modern day Oslo and Copenhagen and near the mouth of the Göta river it was Sweden's only port on the West Coast-hence it had a big strategic importance.
Split into simpler sentences: Lödöse by the year 1000 was an important town for trade, located between modern day Oslo and Copenhagen and near the mouth of the Göta river. It was Sweden's only port on the West Coast-hence it had great strategic importance.