Complex sentence: Pākehā whaling stations became established in the area, and Te Rauparaha encouraged them and many Maori worked in them and some wahine married Pākehā whalers, establishing a lucrative trade of supplies for muskets thereby increasing his mana and military strength.
Split into simpler sentences: Pākehā whaling stations became established in the area, and Te Rauparaha encouraged them and many Māori worked in them. Some Māori women married Pākehā whalers, establishing a lucrative trade of supplies for muskets thereby increasing Te Rauparaha's mana and military strength.