Complex sentence: It is used mainly to treat complex partial, generalized tonic-clonic seizures, myoclonic, Jacksonian, akinetic seizures and since the 1980s it has been a valuable alternative to propranolol in the treatment of essential tremor; its efficacy is similar to propranolol.
Split into simpler sentences: It is used to treat complex partial, generalized tonic-clonic seizures, myoclonic, Jacksonian, and akinetic seizures. Since the early 1980s, it has been a valuable alternative to propranolol in the treatment of essential tremor; its efficacy is similar to propranolol.