Complex sentence: From March 1 to April 11, Japanese officials reported 553 people killed with over 12,000 arrested, 8 policemen and military killed, and 158 wounded.
Split into simpler sentences: From March 1 to April 11, Japanese officials reported 553 people killed, and more than 12,000 arrested. They said that 8 policemen and military were killed, and 158 wounded.