Complex sentence: The Nazi terror in Nowogródek began with the 1942 extermination of the Jews, and was followed by a surge in Polish arrests, then the slaughter of 60 people, including two priests.
Split into simpler sentences: The Nazi terror in Nowogródek began with the 1942 extermination of the Jews. This was followed by a surge in Polish arrests, then the slaughter of 60 people, including two priests.