Complex sentence: In Nashville, she started writing with Shay Mooney of country duo Dan + Shay, where the pair would go on to pen two songs for country group Rascal Flatts' "Rewind" (2014).
Split into simpler sentences: In Nashville, she started writing with Shay Mooney of country duo Dan + Shay. They wrote two songs for country group Rascal Flatts' "Rewind" (2014).