Complex sentence: Many other Bolshevik leaders were arrested, including Trotsky, Kamenev, and Lunacharsky, during the summer of 1917, and Trotsky became a major proponent of Bolshevik ideals after these uprisings, even writing for the Bolshevik Press.
Split into simpler sentences: Many other Bolshevik leaders were arrested, including Trotsky, Kamenev, and Lunacharsky. During the summer of 1917, and Trotsky became a major proponent of Bolshevik ideals after these uprisings, even writing for the Bolshevik Press.