Complex sentence: In the late 1970s, many younger music listeners in America's northwest had not embraced the edgy sound (or styles) of punk and other emerging genres, and local tastes tended toward hard rock, psychedelic and folk-rock musical motifs.
Split into simpler sentences: In the late 1970s, many younger music listeners had not embraced punk and other emerging genres. Local tastes tended toward hard rock, psychedelic and folk-rock musical motifs.