Complex sentence: Citation creators use web forms to take input and format the output according to guidelines and standards, such as the Modern Language Association's MLA Style Manual, American Psychological Association's APA style, or The Chicago Manual of Style Turabian format.
Split into simpler sentences: Citation creators use web forms to take input and format the output according to guidelines and standards. These standards are compiled by associations such as the Modern Language Association MLA Style Manual, American Psychological Association APA style, or The Chicago Manual of Style Turabian format.