Complex sentence: It was not until 1846 that Governor Grey had Te Rauparaha arrested, however his imprisonment, which remained controversial amongst the Ngāti Toa, was not related to the Wairau Affray.
Split into simpler sentences: It was not until 1846 that Governor Grey had Te Rauparaha arrested. However, his imprisonment, which remained controversial amongst the Ngāti Toa, was not related to the Wairau Affray.