Complex sentence: Mac OS X v10.4 "Tiger", requires a Firewire port found only on the late-model iBook G3 FireWire/SE (366/466 MHz).
Split into simpler sentences: Mac OS X v10.4 "Tiger", which requires a Firewire port. This port is found only on the late-model iBook G3 FireWire/SE (366/466 MHz).