Complex sentence: As an example, the field of real numbers is not algebraically closed, because the polynomial "x" 2 + 1 has no real zero whereas the field of complex numbers is algebraically closed which is the content of the Fundamental Theorem of Algebra.
Split into simpler sentences: As an example, the field of real numbers is not algebraically closed, because the polynomial "x" 2 + 1 has no real zero. By contrast, the field of complex numbers is algebraically closed, which is the content of the Fundamental Theorem of Algebra.