In Israel of old, they offered sacrifices symbolic of God’s sacrificing his perfect Lamb. Since the crucifixion of Christ, that has become unnecessary and essentially replaced with the sacrament. If the modern day Jews do not believe that Christ is the Son of God, and are still waiting for their Savior, why did they stop giving sacrifices?
The Jews stopped sacrificing animals because they no longer have a proper place to offer them. In 70 C.E. the Roman army destroyed the Temple in Jerusalem. Since then, with only a few exceptions, the Jewish people have stopped the practice. Because they believe that only at the Temple would such offerings be acceptable to the Lord.
Among the more Orthodox Jewish groups the sacrifices have been replaced with prayers that the Temple might be restored to them. Currently a mosque is in place at the former Jewish temple site which is one of the factors leading to the tension and conflict in the area.
Pretty much in order for the Jews to offer sacrifices again they either need to get the temple site back and build a temple, or they need to believe that the Lord has given them another place that would be acceptable to him. The latter would require the Jews to accept a new prophet of God that can tell them such things.