Complex sentence: The animosity and tension between Metallica and Rock was documented in "A Year and a Half in the Life of Metallica" and', documentaries that explore the intense recording process that resulted in "Metallica".
Split into simpler sentences: The animosity and tension between Metallica and Rock was documented in the documentaries "A Year and a Half in the Life of Metallica" and'. Both explore and document the intense recording process that resulted in "Metallica".