Complex sentence: German zoologist Peter Simon Pallas recognised two species- "Tragulus pygmaeus" and "Antilope pygmaea"-both of which had the same type, the royal antelope.
Split into simpler sentences: German zoologist Peter Simon Pallas recognised two species- "Tragulus pygmaeus" and "Antilope pygmaea". However, both of them were found to have the same type, the royal antelope.