Complex sentence: Quartetville is a virtual meeting place for string players of all abilities and has been using "Quartet Project" miniatures to develop the concept, the "Quartet Project Challenges", a series of free online masterclasses.
Split into simpler sentences: Quartetville is a virtual meeting place for string players of all abilities. Quartetville has been using "Quartet Project" miniatures to develop the concept, the "Quartet Project Challenges", a series of free online masterclasses.