Complex sentence: For example, in a computer that has multiple CPUs or other devices accessing memory, and has more than one clock, the possibility exists that requests from two unsynchronized sources could come in at nearly the same time.
Split into simpler sentences: For example, in a computer that has multiple CPUs or other devices accessing memory, and have more than one clock. It is then possible for requests from two unsynchronized sources to come in at nearly the same time.