Complex sentence: Apple's Power Mac G5 was the first mainstream desktop computer to have water cooling as standard, and Dell later followed suit by shipping their XPS computers with liquid cooling, using thermoelectric cooling to help cool the liquid.
Split into simpler sentences: Apple's Power Mac G5 was the first mainstream desktop computer to have water cooling as standard. Dell followed suit by shipping their XPS computers with liquid cooling, using thermoelectric cooling to help cool the liquid.