Complex sentence: Originally, plantar fasciitis was believed to be an inflammatory condition of the plantar fascia; however, histological changes observed in recent studies have indicated that plantar fasciitis is actually due to a noninflammatory structural degeneration of the plantar fascia rather than an inflammatory process.
Split into simpler sentences: Originally, plantar fasciitis was believed to be an inflammatory condition of the plantar fascia. However, histological changes observed in recent studies have indicated that plantar fasciitis is actually due to a noninflammatory structural degeneration of the plantar fascia rather than an inflammatory process.