Complex sentence: It was released as a single in early 1983, the title track of their album "Sweet Dreams (Are Made of This)", one of their biggest hits, and the song which provided the group with their breakthrough into commercial success.
Split into simpler sentences: It was released as a single in early 1983, and was the title track of their album "Sweet Dreams (Are Made of This)". It is one of their biggest hits and the song which provided the group with their breakthrough into commercial success.