Complex sentence: The album reached No.2 on the United States "Billboard" 200 and No.4 in the United Kingdom, a smash commercial success that returned the band to the popularity of its glory years between the mid- 1970s and early 1980s.
Split into simpler sentences: The album reached No.2 on the United States "Billboard" 200 and No.4 in the United Kingdom. A smash commercial success that returned the band to the popularity of its glory years between the mid- 1970s and early 1980s.