Complex sentence: In 2015, Savchenko was a professional on the Russian version of "Dancing with the Stars", Танцы со звездами where he partnered Adelina Sotnikova, before returning to the U.S. in 2016 to compete on season 23 of the show.
Split into simpler sentences: In 2015, Savchenko was a professional on the Russian version of "Dancing with the Stars", Танцы со звездами where he partnered Adelina Sotnikova. In 2016, Savchenko returned to the U.S. to compete on season 23 of the show.