وَلَا تَفْسُدُ عُمْرَتُهُ وَلَا يَلْزَمُهُ قَضَاؤُهَا
Translation: His Umrah is not invalidated and he is not required to make it up.
La tafsudu negates invalidity; la yalzamuhu qadaʾuha negates the duty of a make-up Umrah. Nevertheless, the offering is still due, as the preceding clause establishes one sheep.
The result is therefore: Umrah remains valid, no make-up Umrah, but one sheep offering.