They researched some of the herbal/homeopathic medicines and their applications that are used by many people on the border.
(They; researched; some of the herbal/homeopathic medicines and their applications) (the herbal/homeopathic medicines and their applications; are used; by many people on the border)
They the herbal/homeopathic medicines and their applications
researched are used
some of the herbal/homeopathic medicines and their applications
by many people on the border