Complex sentence: It is also thought that Thisbe may have been the basis of Shakespeare's Juliet, since the myth of Pyramus and Thisbe plays a role in his "Midsummer Night's Dream".
Split into simpler sentences: It is also thought that Thisbe may have been the basis of Shakespeare's Juliet. The myth of Pyramus and Thisbe played a role in Shakespeare's "Midsummer Night's Dream".