Complex sentence: At the time of her arrival in France, the SPINDLE network was beset by internal strife between the principal agent, André Girard, and his assistant and with the network's radio operator, Adolphe Rabinovitch.
Split into simpler sentences: At the time of her arrival in France, the SPINDLE network was beset by internal strife. Churchill's principal agent, André Girard, quarrelled with his assistant and with the network's radio operator, Adolphe Rabinovitch.