Complex sentence: To compensate V60/70/80 for their fairly weak floating point performance, NEC launched 80-bit floating point co-processor--the μPD72691 (for 32-bit single, 64-bit double, and 80-bit extended precision IEEE 754 format operations) in 1989.
Split into simpler sentences: To compensate V60/70/80 for their fairly weak floating point performance, NEC launched 80-bit floating point co-processor--the μPD72691 /. MU.PD72691/(for 32-bit single, 64-bit double, and 80-bit extended precision IEEE 754 format operations) in 1989.