Complex sentence: The Speaker of the House is also a much more politically active figure than many of his counterparts in other countries, and though he has little formal power, throughout American history the speakership has evolved into one of the nation's key political positions.
Split into simpler sentences: The Speaker of the House is also a much more politically active figure than many of his counterparts in other countries. Throughout American history, the speakership has evolved into one of the nation's key political positions.