Complex sentence: With the introduction of The Pop 100, the Hot 100 Singles Sales chart information has been utilized for compiling both the Hot 100 and Pop 100 thus a recent slight name change to "Singles Sales" (to show its uses for both charts).
Split into simpler sentences: With the introduction of The Pop 100, The Hot 100 Singles Sales also began to see use in compiling its charts also. It has reached a point where The 100 Singles Sales chart became renamed Singles Sales (to show its uses for both charts).