Complex sentence: The first Mahā-Daśā is determined by the position of the natal Moon in a given Nakṣatra, and the lord of the Nakṣatra governs the Daśā.
Split into simpler sentences: The first Mahā-Daśā is determined by the position of the natal Moon in a given Nakṣatra. The lord of the Nakṣatra governs the Daśā.