<<The requirements of both sides conflicted until the end .-Korea's requirement to advance the time of removal of tariff against the U.S.'s proposal eliminating tariff for automobiles in 3 years, and U.S's attempts to annul the temporary safeguard measures .>>
I want to make this sentence more neat.
The points of this sentence is,
1) Korea and U.S. have conflicting ideas with each other and their requirements clashed until the end.
2) Korea's requirement is to advance the time of removal of tariff againt the U.S's proposal that eliminates tariff for automobiles in 3 years.
3)U.S's requirement is to annul the temporary safeguard measures.
please let me know a good way to express this in 1~3 sentences.