Complex sentence: There was a cross-pollination between surf rock, hot rod music, and other influences resulting in an energetic and upbeat style sometimes referred to as frat rock, which can be viewed as an early subgenre of garage rock.
Split into simpler sentences: There was a cross-pollination between surf rock, hot rod music, and other influences resulting in an energetic and upbeat sound. The resulting style is sometimes referred to as frat rock, which can be viewed as an early subgenre of garage rock.