Complex sentence: Musically, JoJo is considered to be primarily a pop and R&B artist; however, the majority of her singles tend to lean more-so towards the former as a marketing tool.
Split into simpler sentences: Musically, JoJo is primarily considered to be a pop and R&B artist. However, the majority of her commercially released singles tend to lend themselves more-so to the former in the form of a marketing tool.