Complex sentence: The earlier ones are often considered to be parts of the National Romanticism interests in folklore; but, like in Child's case, the monumentous efforts of single enthusiasts laid the foundation for the modern academic investigations of epic folk songs.
Split into simpler sentences: The earlier ones are often considered to be parts of the National Romanticisist interests in folklore. Like in Child's case, the monumental efforts of single enthusiasts laid the foundation for the modern academic investigations of epic folk songs.