Complex sentence: The term was in common use in the United States at the end of the 19th century and the early decades of the 20th century, and appears in many popular songs of the era, such as "The Yellow Rose of Texas".
Split into simpler sentences: The term was in common use in the United States at the end of the 19th century and the early decades of the 20th century. It is reflected in such popular songs of the era as "The Yellow Rose of Texas".