Complex sentence: Later in the 19th century pterosaurs were discovered in North America as well, the first of which was a spectacular animal named "Pteranodon" by paleontologist Othniel Charles Marsh.
Split into simpler sentences: Later in the 19th century pterosaurs were discovered in North America as well. The first of which was a spectacular animal named "Pteranodon" by paleontologist Othniel Charles Marsh.