Complex sentence: Seeking help, Lotte finds Lester, who reveals himself to be Captain Mertin, the creator of LesterCorp; he is aware of the portal and has a room dedicated to Malkovich.
Split into simpler sentences: Seeking help, Lotte finds Lester, who reveals himself to be Captain Mertin, the creator of LesterCorp. He is aware of the portal and has a room dedicated to Malkovich.