Complex sentence: When Jack Buchinsky targets Maroni for abandoning him years ago during a heist, he and his associates seek refuge in the GCPD, where he begins to suspect Cobblepot's duplicity when he deliriously stammers about meeting Falcone.
Split into simpler sentences: When Jack Buchinsky targets Maroni for abandoning him years ago during a heist, he and his associates seek refuge in the GCPD. There, he begins to suspect Cobblepot's duplicity when he deliriously stammers about meeting Falcone.