Complex sentence: Specializing in the jamming, interference and "stealing of radar and radio signals", the unit earned considerable renown, even notoriety, for its abilities, and its services were frequently requested by the navy and by American armed forces.
Split into simpler sentences: Specializing in the jamming, interference, and "stealing of radar and radio signals," the unit earned considerable renown, even notoriety, for its abilities. Its services were frequently requested by the navy and American armed forces.