Complex sentence: It was considered a comeback for him in the US market; it was his highest charting album (number 14) since "Tonight" (1984), and earned some of his strongest reviews since "Let's Dance" (1983).
Split into simpler sentences: It was considered a comeback for him in the US market by becoming his highest charting album (number 14) since "Tonight" (1984). It also earned some of his strongest reviews since "Let's Dance" (1983).