Complex sentence: The Harp Twins have posted 46 music videos on YouTube, currently totaling over 11 million views; their cover of "Stairway to Heaven" alone garnering 2 million YouTube hits.
Split into simpler sentences: The Harp Twins have posted 46 music videos on YouTube, currently totaling over 11 million views. Their cover of "Stairway to Heaven" alone garnering 2 million YouTube hits.