Complex sentence: In the early days of jug band music, homEmade guitars and mandolins were sometimes made from the necks of discarded manufactured guitars fastened to large gourds that were flattened on one side, with a sound-hole cut into the flat side, before drying.
Split into simpler sentences: In the early days of jug band music, guitar and mandolins were sometimes made from the necks of discarded guitars fastened to large gourds. The gourds were flattened on one side, with a sound-hole cut into the flat side, before drying.