Complex sentence: The "8087" was the first math coprocessor for 16-bit processors designed by Intel (the I8231 was older but designed for the 8-bit Intel 8080); it was built to be paired with the Intel 8088 or 8086 microprocessors.
Split into simpler sentences: The "8087" was the first math coprocessor for 16-bit processors designed by Intel. It was built to be paired with the Intel 8088 or 8086 microprocessors.