Complex sentence: Once back at Bartok Industries, Martin has become completely encased in his cocoon, and Beth is brought to Bay 17 (where the Telepods are located), where Bartok interrogates her about the "magic word".
Split into simpler sentences: Once back at Bartok Industries, Martin has become completely encased in his cocoon. Afterward, Bartok has her brought to him in the lab with the telepods and interrogates her about the "magic word".