sentence2_structure: A complex machine<>is described<>by: it is made of more than one simple machine$$$it<>is made<>of more than one simple machine
sentence1: A turing machine is a simple theoritical machine that should be able to solve any problem that a more complex machine can, and hence, is used in proofs on complexity theory.
sentence2: A complex machine is described by: it is made of more than one simple machine.
question: Which of the following statements best describes a complex machine?