Complex sentence: The main processor of the 802.11g AirPort Express is a Broadcom BCM4712KFB wireless networking chipset, which has a 200 MHz MIPS processor built in.
Split into simpler sentences: The main processor in the AirPort Express (802.11g version) is a Broadcom BCM4712KFB wireless networking chipset. This has a 200 MHz MIPS processor built in.