Complex sentence: The Redstockings were more influenced by Marxism than were other radical feminist groups, however, they nevertheless strongly rejected socialist feminism (which they referred to as "politico" feminism) as subordinating the issue of women's liberation to class struggle.
Split into simpler sentences: The Redstockings were more influenced by Marxism than were other radical feminist groups. However, they strongly rejected socialist feminism (which they referred to as "politico" feminism) as subordinating the issue of women's liberation to class struggle.