Original sentence: His early poems, written in the late 1920s and 1930s, alternated between modern styles and traditional ones, were written in an intense and dramatic tone, and established his reputation as a left-wing political poet and prophet
Edited sentence: His early poems, in the late 1920s and 1930s, alternated between obscure modern styles and accessible traditional ones, were written in an intense and dramatic tone, and established his reputation as a left-wing political poet and prophet