Complex sentence: However, the album did not get good reviews in the UK (despite reaching No.3 in the UK charts while the title track reached No.17 in the singles charts) and was ultimately less commercially successful than previous efforts.
Split into simpler sentences: However, the album did not get good reviews in the UK. Despite "Guaranteed" reaching No.3 in the UK charts (while the title track, released as a single, reached No.17), it was ultimately less commercially successful than previous efforts.