Complex sentence: The style moved through literary modernism in the early 1960s to radicalism and "dialectical materialism" by 1970 and through the mid- 70s the magazine was run by a Maoist collective.
Split into simpler sentences: The style moved through literary modernism in the early 1960s to radicalism and dialectical materialism by 1970. Moreover, during the mid- 70s the magazine was run by a Maoist collective.