Complex sentence: On the evening of March 23, Marshal Montgomery gave the signal to Operation Plunder, the crossing of the Rhine near Wesel and Rees; a set-piece attack, with prior aerial and artillery bombings.
Split into simpler sentences: On the evening of March 23rd, Marshal Montgomery gave the signal to operation Plunder, the crossing of the Rhine near Wesel and Rees. A set-piece attack, with prior aerial and artillery bombings.