Complex sentence: They are best known for producing the first ever CGI animated series, "ReBoot", the Transformers spin-offs,'and', and for producing the majority of the entries in the Barbie film series for Mattel.
Split into simpler sentences: They are best known for producing the first ever CGI animated series, "ReBoot", as well as the Transformers spin-offs,'and'. They have also become known for producing the majority of the entries in the Barbie film series for Mattel.