Sequoyah devised an alphabet. Because of this, all the different tribes could read a common language.
A.Sequoyah devised an alphabet because all the different tribes could read a common language.
B.All the different tribes could read a common language which belonged to Sequoyah.
C.All the different tribes could read a common language that Sequoyah devised.
D.Sequoyah devised an alphabet whereby all the different tribes could read a common language.