Complex sentence: At 12:30 two companies of the Canterbury Battalion landed and were sent to support the Aucklands, who had now been ordered back to Plugge's Plateau forming on the left of the 3rd Brigade.
Split into simpler sentences: At 12:30 two companies of the Canterbury Battalion landed and sent to support the Aucklands. Who had now been ordered back to Plugge's Plateau forming on the left of the 3rd Brigade.