Korean Political History II: Chapter 9, Exercise 2 — Possible Solution
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CORRECTION
Yoon alleged North Korean threats, but the source calls those claims
unsubstantiated. His stated justification was that the opposition was
engaged in "legislative dictatorship". According to investigations,
the declaration appeared driven by impeachment attempts, budget rejections
and scandals involving his wife.

REWRITE
"Yoon cited opposition 'anti-state activities' and alleged North Korean
threats, which the source calls unsubstantiated; investigations point to
domestic political pressures."

CAUTION
I did not read the investigations themselves.