Complex sentence: This genus of bacteria can form either specific or general symbioses; one species of "Bradyrhizobium" may only be able to nodulate one legume species, whereas other "Bradyrhizobium" species may be able to nodulate several legume species.
Split into simpler sentences: This genus of bacteria can form either specific or general symbioses. This means that one species of "Bradyrhizobium" may only be able to nodulate one legume species, whereas other "Bradyrhizobium" species may be able to nodulate several legume species.