Complex sentence: Founded in 1975, Toshiba Telecommunication Systems Division (TSD) is a division of Toshiba America Information Systems Inc. (TAIS), which is an independent operating company owned by Toshiba America Inc., a subsidiary of Toshiba Corporation.
Split into simpler sentences: Founded in 1975, Toshiba Telecommunication Systems Division (TSD) is a division of Toshiba America Information Systems Inc. (TAIS). This, in turn, is an independent operating company owned by Toshiba America Inc., a subsidiary of Toshiba Corporation.