Complex sentence: Developed at IBM's San Jose, California laboratory under the code name Sawmill it was an up to 1.5 GB full height 5¼-inch HDD using up to 8 130 mm disks.
Split into simpler sentences: Developed at IBM's San Jose, California laboratory under the code name Sawmill. It was an up to 1.5 GB full height 5¼-inch HDD using up to 8 130 mm disks.