Complex sentence: The defense ministry of Russia accused the U.S. of using the hydrazine worries as a cover for a test of an ASAT, and noted that extraordinary measures had never before been needed to deal with the many spacecraft that had fallen to Earth.
Split into simpler sentences: The defense ministry of Russia accused the U.S. of using hydrazine and viewed it as a cover for the test of an ASAT. It also noted that extraordinary measures had never before been needed to deal with the many spacecraft that had fallen to Earth.