Complex sentence: The tree's Maori name means "Lord of the Forest", and is the name of a god in the Maori pantheon, is the tallest and most massive kauri known to stand today.
Split into simpler sentences: The tree's Māori name means "Lord of the Forest", and is the name of a god in the Māori pantheon. Tāne Mahuta is the tallest and most massive kauri known to stand today.