Complex sentence: Isolated attacks on Jews also occurred at Colchester, Thetford, and Ospringe, but the most striking incident occurred at York on the night of March 16 (Shabbat HaGadol, the Shabbat before Passover) and 17 March 1190.
Split into simpler sentences: Isolated attacks on Jews also occurred at Colchester, Thetford, and Ospringe. The most striking incident occurred at York on the night of March 16 (Shabbat HaGadol, the Shabbat before Passover) and 17 March 1190.