Complex sentence: In 1811, naturalist Johann Karl Wilhelm Illiger placed Steller's sea cow under the genus "Rytina", which many writers at the time adopted, even though the animal had already been classified long before this.
Split into simpler sentences: In 1811, naturalist Johann Karl Wilhelm Illiger placed Steller's sea cow under the genus "Rytina", which many writers at the time adopted. However, the animal had already been classified long before this.