Complex sentence: Historically, the leopard cats of continental Asia and of the Sundaland islands were considered a single species, but a 2017 paper reclassified the leopard cat occurring in the Sundaland as a distinct species, "Prionailurus javanensis".
Split into simpler sentences: Historically, the leopard cat of continental Asia and of the Sundaland islands was considered a single species. As of 2017, the leopard cat occurring in the Sundaland is recognised as a distinct species, "Prionailurus javanensis".