Complex sentence: Internally, popular sentiments radicalized the Revolution significantly, culminating in the rise of Maximilien Robespierre and the Jacobins and virtual dictatorship by the Committee of Public Safety during the Reign of Terror from 1793 until 1794 during which between 16,000 and 40,000 people were killed.
Split into simpler sentences: Internally, popular sentiments radicalized the Revolution significantly, culminating in the rise of Maximilien Robespierre and the Jacobins. There was virtual dictatorship by the Committee of Public Safety during the Reign of Terror from 1793 until 1794, during which between 16,000 and 40,000 people were killed.