Complex sentence: Originally considered a megalosaurid by Cope, it was later assigned to its own family (Dryptosauridae) by Marsh, and later found (through phylogenetic studies of the 1990s) to be a coelurosaur, though its exact placement within that group remained uncertain.
Split into simpler sentences: Originally considered a megalosaurid by Cope, it was later assigned to its own family (Dryptosauridae) by Marsh. Other phylogenetic studies during the 1990s suggested that "Dryptosaurus" was a coelurosaur, though its exact placement within that group remained uncertain.