Complex sentence: The Osborne Executive was the palnned successor of the already commercially successful osborne 1, released in April, 1981 by Osborne Computer Corporation, the Executive which was a collection of the good features from the 1 and fixes of its predessors flaws.
Split into simpler sentences: The Osborne Executive was the planned successor of the already commercially successful Osborne 1, released in April, 1981 by Osborne Computer Corporation. The Executive was a collection of the good features from the Osborne 1 and fixes of it's predessors flaws.