Complex sentence: In contemporary English language usage, an advocate of Trotsky's ideas is often called a "Trotskyist"; a Trotskyist can be called a "Trotskyite" or "Trot", especially by a critic of Trotskyism.
Split into simpler sentences: In contemporary English language usage, an advocate of Trotsky's ideas is often called a "Trotskyist". A Trotskyist can be called a "Trotskyite" or "Trot", especially by a critic of Trotskyism.