Complex sentence: For Holmes, the Civil War destroyed his entire perspective on the world and greatly shaped his judicial philosophy, which, later on, emerged at roughly the same time as Dewey, James and Peirce were beginning to develop pragmatist ideas.
Split into simpler sentences: For Holmes, the Civil War destroyed his entire perspective on the world and greatly shaped his judicial philosophy. Holmes's judicial philosophy developed at roughly the same time as Dewey, James and Peirce were beginning to develop pragmatist ideas.