Complex sentence: However, the book did receive a notably negative review by Delmore Schwartz in "Partisan Review" who would prove to be one of Patchen's fiercest critics throughout his career (and pratically Patchen's literary enemy).
Split into simpler sentences: However, the book did receive a notably negative review by Delmore Schwartz in "Partisan Review". Schwartz would prove to be one of Patchen's fiercest critics throughout his career (and pratically Patchen's literary enemy).