Original sentence: Administrated by the DO, the PM group (Special Operations) maintained an elite cadre (Special Activities Division) that are highly skilled in weaponry; covert transport of personnel and material by air, sea, and land; guerrilla warfare; the use of explosives; and escape and evasion techniques
Edited sentence: Administrated by the DO, the PM group (Special Operations) maintained an elite cadre (Special Activities Division) that is highly skilled in weaponry; covert transport of personnel and material by air, sea, and land; guerrilla warfare; the use of explosives; and escape and evasion techniques