Complex sentence: Trotsky identified as an orthodox Marxist and Bolshevik-Leninist, and supported founding a vanguard party of the working-class, proletarian internationalism, and a dictatorship of the proletariat based on working-class self-emancipation and mass democracy.
Split into simpler sentences: Trotsky identified as an orthodox Marxist and Bolshevik-Leninist, and supported founding a vanguard party of the working-class. Trotsky still supported proletarian internationalism, and a dictatorship of the proletariat based on working-class self-emancipation and mass democracy.