Complex sentence: The avifauna of Palestine is unusually rich for so small an area, and includes 348 known species: 271 Palearctic, 40 Ethiopian (10 of which are also Indian), 7 Indian, and 30 peculiar to Syria.
Split into simpler sentences: The avifauna of Palestine is unusually rich for so small an area. In this area, he identified 348 species: 271 Palearctic, 40 Ethiopian (10 of which are also Indian), 7 Indian, and 30 peculiar to Syria.