Complex sentence: At the 1844 Boston lecture, Bennett was not well received: he was pelted with rotten eggs and chased through Boston by the "vast assemblage," which ran over several Boston police officers in the process.
Split into simpler sentences: At the 1844 Boston lecture, Bennett was not well received. He was pelted with rotten eggs and chased through Boston by the'vast assemblage,' who ran over several Boston police officers in the process.