Complex sentence: The terms became common with the time sharing systems of the 1960s and Bulletin Board Systems (BBS) in the 1970s, but early home computers and personal computers did not generally require them until Windows NT, OS/2 and Linux in the 1990s.
Split into simpler sentences: The terms became common with the time sharing systems of the 1960s and Bulletin Board Systems (BBS) in the 1970s. Early home computers and personal computers did not generally require them until Windows NT, OS/2 and Linux in the 1990s.