Complex sentence: Ultratip differs from the Ultratop charts, in that Ultratip charts depend mostly on airplay, whereas Ultratop charts are based solely on sales; however, it should be noted that a song cannot chart on the Ultratip chart on airplay figures alone.
Split into simpler sentences: Ultratip differs from the Ultratop charts, in that Ultratip charts depend mostly on airplay, whereas Ultratop charts are based solely on sales. However, it should be noted that a song cannot chart on the Ultratip chart on airplay figures alone.