Complex sentence: A political decoy is a person employed to impersonate a politician, to draw attention away from the real person or to take risks on their his can also apply to military figures, or civilians impersonated for political/espionage purposes.
Split into simpler sentences: A political decoy is a person employed to impersonate a politician, to draw attention away from the real person or to take risks on their behalf. This can also apply to military figures, or civilians impersonated for political/espionage purposes.