Complex sentence: Images of type 1 are normally created by copying the contents of the computer's mass storage to a file elsewhere, often with disk cloning programs, though on many systems a complete system image cannot be created by a disk cloning program.
Split into simpler sentences: Images of type 1 are normally created by copying the contents of the computers mass storage to a file elsewhere. Though on many system a complete system image cannot be created by a disk cloning program.