Complex sentence: Bush's textual criticism on Shakespeare and John Milton was widely influential, and his "English Literature in the Earlier Seventeenth Century," though overtaken by later, more theoretically informed approaches to literary history, remains a standard reference work.
Split into simpler sentences: Bush's textual criticism on Shakespeare and John Milton was widely influential. His "English Literature in the Earlier Seventeenth Century," though later overtaken by more theoretically-informed approaches to literary history, remains a standard reference work.