Complex sentence: Jessica Molaskey is a singer of torch songs and show tunes who is a professional recording artist, she also appeared in a dozen Broadway shows and has premiered theater pieces off Broadway and in regional theaters across the US.
Split into simpler sentences: Jessica Molaskey is a singer of torch songs and show tunes who is a professional recording artist. She has appeared in a dozen Broadway shows and has premiered theater pieces off-Broadway and in regional theaters across the US.