Complex sentence: In 1985, Sord began to work with Toshiba Corporation and in 1999 became a wholly owned subsidiary renamed as "Toshiba Personal Computer System Corporation" ("TOPS" for short).
Split into simpler sentences: In 1985, Sord began to work with Toshiba Corporation. In 1999, Sord became a wholly owned subsidiary of Toshiba and renamed as "Toshiba Personal Computer System Corporation" ("TOPS" for short).