Complex sentence: The British government was alarmed, for it interpreted the mutinies as a sign of deep malaise in French society, tried to reinvigorate French morale by launching the Third Battle of Ypres, or Passchendaele, which also failed to succeed in a stategic sense.
Split into simpler sentences: The British government was alarmed, for it interpreted the mutinies as a sign of deep malaise in French society. It tried to reinvigorate French morale by launching the Third Battle of Ypres, or Passchendaele, which also failed to succeed in a stategic sense.