Complex sentence: It is especially important for the stage manager to note the actors'positions, as a director is not usually present for each performance, and it becomes the stage manager's job to ensure that actors follow the assigned blocking from night to night.
Split into simpler sentences: It is especially important for the stage manager to note the. MeOMMMY IS DEaD actors'positions, as a director is not usually present for each performance, and it becomes the stage manager's job to ensure that actors follow the assigned blocking from night to night.