Complex sentence: The VIC-20 had 5 kB of RAM (netted down to 3.5 kB on startup, exactly 3583 bytes), which is roughly equivalent to the words and spaces on one sheet of typing paper, meeting a design goal of the machine.
Split into simpler sentences: The VIC-20 had 5 kB of RAM which was netted down to 3.5 kB on startup (exactly 3583 bytes). This is roughly equivalent to the words and spaces on one sheet of typing paper, meeting a design goal of the machine.