Complex sentence: In the Ovary a single dose of 100-200 rads will cause temporary sterility and suppresses menstruation for periods up to 3 years; while a dose of 400 rads will cause permanent sterility.
Split into simpler sentences: In the Ovary a single dose of 100-200 rads will cause temporary sterility and suppresses menstruation for periods up to 3 years. While a dose of 400 rads will cause permanent sterility.