Complex sentence: Central American English is used to refer to a dialect of American English, a region also known as Upper Midwest among some linguists, consisting primarily of the area of Northern American English, specifically excluding the area of Inland Northern American English and areas east thereof.
Split into simpler sentences: Central American English is used to refer to a dialect of American English. The region is also known as Upper Midwest among some linguists, consisting primarily of the area of Northern American English, specifically excluding the area of Inland Northern American English and areas east thereof.