Sentence Correction

49. As an Actress and, more importantly, as a teacher of acting, Stella Adler was one of the most influential artists in the American theater, who trained several generations of actors including Marlon Brando and Robert Deniro

a. same Is the problem here that the theatres trained the several generations?

b. Stella Adler, one of the most influential artists in the American theater, trained several generations of actors who include (Is the problem here that the theatres trained the several generations?)

c. Stella Adler was one of the most influential artists in the American theater, training several generations of actors, whose ranks included (but here doesn’t it look as if the theater was training the generations?) How does training fix the error?
d. One of the most influential artist in the American theater was Stella Adler, who trained several generations of actors including
e. One of the most influential artist in the American theater, Stella Adler, trained several generations of actors whose ranks included

Can someone asnwer this in an easy manner please