Complex sentence: Sean and John's most honored and memorable performance was to be on stage alongside legendary tap dancers, The Nicholas Brothers and Gregory Hines, a tour with Riverdance, and being featured in Beyonce's "I Am" tour and her album DVD.
Split into simpler sentences: Sean and John's most honored and memorable performance was to be on stage alongside legendary tap dancers, The Nicholas Brothers and Gregory Hines. The twin tap dancers have also been on tour with Riverdance and featured in Beyonce's "I Am" tour and her album DVD.