Complex sentence: In 1981, the follow-on FPS-164 was produced, followed by its big brother, the 264 having the same architecture which was 5 times faster using ECL instead of TTL chips.
Split into simpler sentences: In 1981, the follow-on FPS-164 was produced, followed by its big brother, the 264 having the same architecture. This was 5 times faster using ECL instead of TTL chips.