Complex sentence: Early in the twentieth century the reigning monarch, King Michael Maranovitch of the House of Maranovitch was assassinated together with his family, and civil war broke out as the Iarovitch tried to crown Nicola Iarovitch king.
Split into simpler sentences: Early in the twentieth century, reigning monarch, King Michael Maranovitch of the House of Maranovitch was assassinated with his family. Civil war broke out as the Iarovitch tried to crown Nicola Iarovitch king.