No this is not possible in the current version. In MS Project the only time one sees multiple bars in one row is when using roll ups and in that case it is the bars of the descendant tasks that are displayed in the ancestor summary rows. Also in MS Project a task can be split but that is a bit different because that is essentially pausing/interrupting a single task for some period of time and also has a different visual representation to indicate the interrupted time. May I ask what the scenario is in your case?