Complex sentence: On 26 September 1939, the government of Édouard Daladier outlawed the PCF; 35 communist deputies and thousands of communist activists were arrested in the months that followed, and more than 3,000 communist refugees were interned as undesirable foreigners.
Split into simpler sentences: On 26 September 1939 the government of Édouard Daladier outlawed the PCF. Thirty five communist deputies and thousands of communist activists were arrested in the months that followed, and more than 3,000 communist refugees were interned as undesirable foreigners.