Complex sentence: The term "sex radical" is also used with the term "free lover" although being referred, as a sex radical is what most people liked to be called; the term "free love" often had a negative connotation.
Split into simpler sentences: The term "sex radical" is also used interchangeably with the term "free lover". "Sex radical" is what most people liked to be called, because the term "free love" often had a negative connotation.