Complex sentence: When the computer is built it gives the scientists instructions for the creation of a living organism named Andromeda, but one of the scientists, John Fleming, fears that Andromeda's purpose is to subjugate humanity.
Split into simpler sentences: When the computer is built it gives the scientists instructions for the creation of a living organism, named Andromeda. However, one of Andromeda's creators, John Fleming, fears that Andromeda's purpose is to subjugate humanity.