Complex sentence: There is also a variant of TN called atypical trigeminal neuralgia (also referred to as "trigeminal neuralgia, type 2"), based on a recent classification of facial pain.
Split into simpler sentences: There is also a variant of trigeminal neuralgia called atypical trigeminal neuralgia. This variant is also called "trigeminal neuralgia, type 2", based on a recent classification of facial pain.