Complex sentence: There is a conjecture in a book by Mike Golden that levy was murdered by the Cleveland police or local government because of his anti-establishment writings, but this controversy died down shortly after publication, and is only maintained by those far-removed from the poetry community.
Split into simpler sentences: There is a no longer fashionable conjecture in a book by Mike Golden that levy was murdered by the Cleveland police or local government because of his anti-establishment writings. This controversy died down, shortly upon publication, and is only maintained by those far-removed from the poetry community.