Complex sentence: On Tuesday 3 January 1984 a state of emergency was declared after the demonstrations had spread to Tunis and Sfax, with demonstrators setting fire to cars and hurling rocks at policemen, who responded with tear gas.
Split into simpler sentences: On Tuesday 3 January 1984 a state of emergency was declared after the unrest had spread to Tunis and Sfax. Demonstrators set fire to cars and hurled rocks at policemen, who responded with tear gas.