Complex sentence: In this period many bands were heavily influenced by surf rock and hot rod music and there was a cross-pollination between these influences resulting in an energetic and upbeat sound sometimes referred to as frat rock, which is sometimes viewed as an early subgenre of garage rock.
Split into simpler sentences: In this period many bands were heavily influenced by surf rock and hot rod music and there was a cross-pollination between these influences resulting in an energetic and upbeat sound. This is sometimes referred to as frat rock, which can be viewed as an early subgenre of garage rock.