请教－杨鹏难句中第22句

trevorlaw

22.   Althoughfiction assuredly springs from political circumstances，its authorsreact to those circumstances in ways other than ideological，and talkingabout novels and stories primarily as instruments of ideology circumvents muchof the fictional enterprise.
其实句子问题不大，解决生词之后意思也好懂，但是从语法的角度很难理解。为什么and 后面是talking？这个AND的前后各是一个完整的句子，意思也是递进关系，这个and前后怎么并列呢？
谢谢。