Complex sentence: Based on her account, claiming she had been attacked by several black men, the police quickly arrested Frank Hairston, Jr. and Booker Millner, followed by another four men during the night, based on the first two men's confessions.
Split into simpler sentences: Based on her account, claiming she had been attacked by several black men, the police quickly arrested Frank Hairston, Jr. and Booker Millner. They were followed by the apprehension of another four suspects during the night, based in part on the first two men's confessions.