Complex sentence: Until the Hobbit case, mockbuster production houses have been able to achieve sound-alike titling to such an extent that even actors in the movies have been confused about which movie they are starring in.
Split into simpler sentences: Until the Hobbit case, mockbuster production houses have been able to achieve that effect. They have been able to achieve sound alike titling to such an extent that even actors in the movies have been confused about which movie they are starring in.