Complex sentence: The Order Trigonotarbida is an extinct group of arachnids whose fossil record extends from the Silurian to the Lower Permian and are known from several localities in Europe and North America, as well as one record from Argentina.
Split into simpler sentences: The Order Trigonotarbida is an extinct group of arachnids whose fossil record extends from the Silurian to the Lower Permian. These animals are known from several localities in Europe and North America, as well as a single record from Argentina.