Complex sentence: While Taft and Sanford both died in 1930, Sutherland and Butler remained on the court well into the 1930s, forming half of the conservative bloc of justices known as the "Four Horsemen" who often opposed New Deal policies.
Split into simpler sentences: While Taft and Sanford both died in 1930, Sutherland and Butler remained on the court until the late 1930s. The duo formed half of the conservative bloc of justices known as the "Four Horsemen" who often struck down New Deal policies.