Complex sentence: Immediately after the Armistice was signed on 11 November 1918, "Cushing" remained in French waters, towing, which had grounded on rocks in a French harbor into Brest on 3 December.
Split into simpler sentences: Immediately after the Armistice was signed on 11 November 1918, "Cushing" remained in French waters. She towed, which had grounded on rocks in a French harbor, into Brest on 3 December.