Complex sentence: The most distinctive feature of "Therizinosaurus" was the presence of three gigantic claws on each digit of its front limbs, which reached nearly a meter (approximately 3 feet) in length.
Split into simpler sentences: The most distinctive feature of "Therizinosaurus" was the presence of three gigantic claws on each digit of its front limbs. These were especially large in "Therizinosaurus", reaching nearly a meter (approximately 3 feet) in length.