Complex sentence: At the moment Birdboot crosses into the realm of the stage to answer the phone, the barrier vanishes as he now becomes part of the plot and assumes the role of Simon, as his love life parallels that of the Casanova.
Split into simpler sentences: At the moment Birdboot crosses into the realm of the stage to answer the phone, the barrier vanishes as he now becomes part of the plot. After Birdboot answers the phone and remains on stage, he becomes involved in the plot and assumes the role of Simon, as his love life parallels that of the casanova.