This is a complex sentence. It has a dependent clause ("Without a moment's hesitation,") which starts the sentence , and after it, there is a comma separating the independent clause, and so all the other independentclauses are correctly separated by commas . In a direct order, the dependent clause would be in the end: "The girlwalked over to the table on which the book lay, picked it up, and walked out of the room <em>without a moment´s hesitation. </em>