Complex sentence: In December 2010, Tsui collaborated with fellow YouTube singer Christina Grimmie, singing "Just A Dream", which is the most viewed video on the YouTube channel "KurtHugoSchneider", with more than seventy million views.
Split into simpler sentences: In December 2010, Tsui collaborated with fellow YouTube singer Christina Grimmie, singing "Just A Dream". The most viewed video on the YouTube channel "KurtHugoSchneider", with more than seventy million views.