Complex sentence: The region is centered on the Shreveport/Bossier metropolitan area in Northwest Louisiana, although Marshall in Northeast Texas, Natchitoches, Louisiana, and both Texarkana, Texas and Texarkana, Arkansas retain a large degree of autonomy.
Split into simpler sentences: The region is centered on the Shreveport/Bossier metropolitan area in Northwest Louisiana. Although Marshall in Northeast Texas, Natchitoches, Louisiana, and both Texarkana, Texas and Texarkana, Arkansas retain a large degree of autonomy.