Which sentence best combines these ideas into a compound-complex sentence? After rising from a peaceful lake in Minnesota, the Mississippi River flows south past 10 states and empties into the Gulf of Mexico. The Mississippi River flows south from a peaceful lake in Minnesota past 10 states to empty into the Gulf of Mexico at its mouth in Louisiana. The Mississippi River, the source of which is a peaceful lake in Minnesota, flows south past 10 states and empties into the Gulf of Mexico at its mouth in Louisiana. The source of the Mississippi River is a peaceful lake in Minnesota; from there, the river flows south past 10 states to its mouth in Louisiana, where it empties into the Gulf of Mexico.