Complex sentence: Sweden's only Atlantic settlement, Gothenburg's first predecessor Lödöse ("Gothenburg 1 ") at the mouth of the Göta Älv, was built about 1200, superseded by New Lödöse ("Gothenburg 2") near the modern town.
Split into simpler sentences: Sweden's only Atlantic settlement, Lödöse, built about 1200, (known as "Gothenburg 1") was the first settlement located at the mouth of the Göta Älv. It was followed by New Lödöse ("Gothenburg 2") located near the modern town.