Complex sentence: The Army established Fort Reno, Fort Phil Kearny and Fort C. F. Smith along the route, staffed with forces to protect travelers, but Indian raids on parties along the trail and around the forts continued.
Split into simpler sentences: The Army established Fort Reno, Fort Phil Kearny and Fort C. F. Smith along the route, staffed with troops meant to protect travelers. However, Indian raids along the trail and around the forts continued.