Complex sentence: Kim felt that in order to ensure survival when China was in decline, Korea would have to borrow Japanese help to modernize itself, and that the only solution to the situation was to introduce a new political force to wipe out the present dominant party.
Split into simpler sentences: Kim felt that in order to ensure survival when China was in decline, Korea would have to borrow Japanese help to modernize itself. Kim saw that the only solution to the situation was to introduce a new political force to wipe out the present dominant party.