Complex sentence: The 8087, the first of the x87 family, was built to be paired with the Intel 8088 and 8086 microprocessors and the purpose was to speed up computations on demanding applications involving floating point arithmetic.
Split into simpler sentences: The 8087, the first of the x87 family, was built to be paired with the Intel 8088 or 8086 microprocessors. The purpose of it was to speed up computations on demanding applications involving floating point arithmetic.