Complex sentence: These terms are not explicitly used in the Geneva Conventions, but the Third Geneva Convention of 1949 defines the term "lawful combatant", from which the term'unlawful combatant' is derived.
Split into simpler sentences: These terms are not explicitly used in the Geneva Conventions. But, the Third Geneva Convention of 1949 defines the term "lawful combatant", from which the term'unlawful combatant' is derived.