Complex sentence: Denali is emerging as a site of interesting fossils, including footprints (ichnites) that when they were first publicly reported in May 2006, were credited with being the first evidence of prehistoric wading birds probing in mudflats for food during the Late Cretaceous Period.
Split into simpler sentences: Denali is emerging as a site of interesting fossils, including ichnites (fossilized footprints). These ichnites were first publicly reported in May 2006, and were credited with being the first evidence of prehistoric wading birds probing in mudflats for food during the Late Cretaceous Period.