Complex sentence: Hatching larvae are about 10 mm long, and in their first summer, they grow to 50 to 100 mm, but the Santa Cruz long-toed salamander is generally considered the smaller species.
Split into simpler sentences: Hatching larvae are approximately ten millimeters long, and in their first summer, they grow to 50 to 100 millimeters. But the Santa Cruz long-toed salamander is generally considered the smaller species.