Complex sentence: In young women with poor reserve when eggs are obtained they have near normal rates of implantation and pregnancy rates, but they are at high risk for IVF cancellation; if eggs are are obtained pregnancy rates are typically better than in older woman with normal reserve women.
Split into simpler sentences: In young women when eggs are obtained they have near normal rates of implantation and pregnancy rates. Young woman with poor reserve are at high risk for IVF cancellation, but if eggs are are obtained pregnancy rates are typically better than in older woman with normal reserve women.