Complex sentence: Some 600 species of plants are known in the area; common types in the valley floor include the Joshua tree, Mojave yucca, banana yucca, creosote, and blackbrush.
Split into simpler sentences: Some 600 species of plants are known in the area. Common types in the valley floor include the Joshua tree, Mojave yucca, banana yucca, creosote, and blackbrush.