Complex sentence: Anteros was the god of requited love, literally "love returned" or "counterpart love" and also the punisher of those who scorn love and the advances of others, or the avenger of unrequited love.
Split into simpler sentences: Anteros was the god of requited love, literally "love returned" or "counterpart love". He punished those who scorned love and the advances of others, and was the avenger of unrequited love.