Complex sentence: However, the trusted character can "burn" a Trust Point to Betray the trusting character and gain a short-term advantage over them (like blocking use of an Investigative ability or subtracting a penalty from the result of a General ability die roll).
Split into simpler sentences: However, the trusted character can "burn" a Trust Point to Betray the trusting character. This allows the traitor to gain a short-term advantage over the trusting character (like blocking use of an Investigative ability or subtracting a penalty from the result of a General ability die roll).