Complex sentence: For the Vedic people Agni was the multifaceted psychological power connected with will, action and related powers, Isha Upanishad focuses on this tradition of Agni as the Divine Will which motivates and executes.
Split into simpler sentences: For the Vedic people Agni was the multifaceted psychological power connected with will, action and related powers. The Isha Upanishad focuses on this tradition of Agni as the Divine Will which motivates and executes.