Consider the comma in bold, which is used to connect two sentences If it is not the best choice, replace it with a different punctuation mark. i I Arturo Toscanini, a celebrated conductor, had planned to travel to Europe on the Lusitania, however, by a twist of fate , he decided to return earlier on a different ship. This decision saved his life,as the Lusitania was torpedoed by a German submarine en route

The comma in the sentence is not the best choice for connecting two independent clauses. Instead, a semicolon or a period would be more appropriate to separate the two sentences. Here is the revised sentence with a semicolon:<br /><br />"Arturo Toscanini, a celebrated conductor, had planned to travel to Europe on the Lusitania; however, by a twist of fate, he decided to return earlier on a different ship. This decision saved his life, as the Lusitania was torpedoed by a German submarine en route."<br /><br />Alternatively, you could use a period:<br /><br />"Arturo Toscanini, a celebrated conductor, had planned to travel to Europe on the Lusitania. However, by a twist of fate, he decided to return earlier on a different ship. This decision saved his life, as the Lusitania was torpedoed by a German submarine en route."