Complex sentence: On Saturday, 14 May 2011, "MSC Opera" suffered engine failure in the Baltic Sea, and was towed to the port of Nynäshamn south of Stockholm where the passengers were transferred to smaller passenger boats.
Split into simpler sentences: On Saturday, 14 May 2011, "MSC Opera" suffered engine failure in the Baltic Sea. She was towed to the port of Nynäshamn south of Stockholm where passengers were transferred to smaller passenger boats.