Complex sentence: Many clinics that broker transnational surrogacy, prefer women who have already given birth, as they have proof of a viable uterus, and prefer women with their own children, with the hope that the surrogate will not bond with the fetus.
Split into simpler sentences: Many clinics that broker transnational surrogacy prefer women who have already given birth, as the clinics have evidence of a viable uterus. The clinics may also prefer women who have their own children, with the hope that the surrogate will not bond with the fetus.