Complex sentence: The Undertaker carried JBL to the hearse but Jon Heidenreich came out of the hearse and covered his mouth with a soaked rag filled with chloroform.
Split into simpler sentences: The Undertaker carried JBL to the hearse, and Jon Heidenreich came out of the hearse. Heidenreich began to attack the Undertaker, covered his mouth with a soaked rag filled with chloroform.