Complex sentence: Preston confronts Irvine with his theory that the operation was deliberately blown by Philby; the latter did not know Petrofsky's location but instead sent Franz Winkler, with an obviously forged passport, to the location of the transmitter, and ultimately, to Petrofsky.
Split into simpler sentences: Preston confronts Irvine with his theory that the operation was deliberately blown by Philby. Philby did not know Petrofsky's location but instead sent Franz Winkler, with an obviously forged passport, to the location of the transmitter, and ultimately, to Petrofsky.