Complex sentence: Because Satan is responsible for all evil including death, while Ahura Mazda is responsible for all good (including life) the concept of world tree in Persian Mythology is very closely related to the concept of Tree of Life.
Split into simpler sentences: Because Satan is responsible for all evil including death, while Ahura Mazda is responsible for all good (including life). The concept of Word Tree in Persian Mythology is very closely related to the concept of Tree of Life.