Complex sentence: In this story Virgil Samms and Roderick Kinnison, two very important members of the eugenics project, are introduced and play they will the play leading rolls in the next story First Lensman.
Split into simpler sentences: In this story Virgil Samms and Roderick Kinnison, two very important members of the eugenics project, are introduced. They will the play leading rolls in the next story First Lensman.