Complex sentence: When these mated with male mice (XY), some of the offspring had nDNA from the original father and also from the mated male but not from the female blastocysts or the surrogate mother.
Split into simpler sentences: When these mated with male mice (XY). Some of the offspring had nDNA from the original father and also from the mated male but not from the female blastocysts or the surrogate mother.