Original sentence: Even when some localities received the appointed Gediminid leaders, the  Lithuanian higher nobility in the Ruthenian lands largely embraced the Slavic customs and Orthodox Christianity and became indistinguishable from a larger Ruthenian nobility resulting in the two cultures merging to the extent that much of the upper class of the Grand Duchy called themselves Lithuanians , yet spoke the Ruthenian language In the effect of the processes, Lithuanian higher nobility became largely Ruthenian, while the nobility in the ethnic Lithuania and Samogitia continued to use native spoken Lithuanian language.In the early Middle Ages the consolidation of Baltic lands by the Duchy of Lithuania led to the gradual Lithuanization and subsequent assimilation of neighbouring Baltic tribes or their parts, including the Selonians, Jotvingians, Nadruvians and Curonians who shared religious, cultural, and linguistic similarities
Edited sentence: Even when some localities received the appointed Gediminid leaders, the  Lithuanian higher nobility in the Ruthenian lands largely embraced the Slavic customs and Orthodox Christianity and became indistinguishable from a larger Ruthenian nobility resulting in the two cultures merging to the extent that much of the upper class of the Grand Duchy called themselves Lithuanians , yet spoke the Ruthenian language In the effect of the processes, Lithuanian higher nobility became largely Ruthenian, while the nobility in the ethnic Lithuania and Samogitia continued to use their native Lithuanian language.In the early Middle Ages the consolidation of Baltic lands by the Duchy of Lithuania led to the gradual Lithuanization and subsequent assimilation of neighbouring Baltic tribes or their parts, including the Selonians, Jotvingians, Nadruvians and Curonians who shared religious, cultural, and linguistic similarities with the Lithuanians