Complex sentence: Stone toured with "Sisters in the Spirit" in 2007; toured in Europe in May/June 2008; toured on various Summer Festivals in the U.S. in summer 2008 (including three headlining June shows); and two in the Netherlands in August 2008.
Split into simpler sentences: Stone toured with "Sisters in the Spirit" in 2007. She also toured in Europe in May/June 2008 and performed at various Summer Festivals in the U.S. in summer 2008 (including three headlining June shows) and two in the Netherlands in August 2008.