Complex sentence: On 9 November Hindenburg and Groener told Wilhelm that the army no longer obeyed the emperor and that he would have to abdicate; both Hindenburg and Groener played a decisive role in persuading Emperor Wilhelm II to abdicate for the greater good of Germany.
Split into simpler sentences: On 9 November Hindenburg and Groener told Wilhelm that the army no longer obeyed the emperor and that he would have to abdicate. Both Hindenburg and Groener played a decisive role in persuading Emperor Wilhelm II to abdicate for the greater good of Germany.