Original sentence: The IA-32 instruction set is usually described as a CISC architecture
Edited sentence: In 2000, AMD announced a derivative of IA-32 called x86-64 (later renamed AMD64), which added 64-bit computing capabilities.Modern x86 microarchitectures such as K7, NetBurst, and newer, are often referred to as post-RISC processors.The IA-32 instruction set is usually described as a CISC architecture, though such classifications have become less meaningful with advances in microprocessor design.The longevity is partially due to full backward compatibility and the architecture has also been extended to 64-bits,  without breaking compatibility.This extended architecture was later also adopted by Intel with minor changes.This extension is called Intel 64 by Intel or AMD64 by AMD (and referred to generically as x86-64 or x64) and is entirely unrelated to the 64-bit IA-64 architecture implemented in Intel's Itanium series