"We [bishops] understand the pain of those for whom divorce seemed the only recourse...We urge them to make frequent use of the sacraments, especially the Sacraments of Holy Eucharist and Reconciliation…We encourage divorced persons who wish to marry in the Catholic Church to seek counsel about the options that exist to remedy their situation, including the suitability of a declaration of nullity when there is no longer any hope of reconciliation of the spouses."
FAQs explain who needs an annulment, the process, and its effects. For more information about the Church's teaching about divorce.

https://www.usccb.org/topics/marriage-and-family-life-ministries/annulment
 

The term “annulment” is a misnomer because the Church does not undo or erase a marriage bond. Rather the Church issues declarations of nullity when it discovers that the parties were not truly joined by God and hence a full spiritual sacramental marriage as understood by the Church was not present.

People who have received a declaration of nullity have expressed feelings of relief, wholeness and healing as a result of the process. For those who have remarried outside of the Church, a Declaration of Nullity provides the opportunity to exercise all the privileges, receive the grace the sacraments offer and re-establish a closer bond with the community. This is a process of understanding, healing, and of making the justice and compassion of God more available to the divorced person.

You may approach your pastor, priest/deacon or the layperson in your parish who has been trained in the process. If you encounter difficulties at your own parish, you may seek a referral directly from the Tribunal.

The length of time varies from diocese to diocese, depending on the number of pending petitions, the cooperation of involved parties and the specific circumstances.

All have a right to petition. Whether that petition can be granted depends on the existence of recognized grounds for nullity and proof of same.

For more information regarding annulments, please contact your parish pastor about the Declaration of Nullity process or the Archdiocese of Los Angeles Marriage Tribunal at (213) 637-7245.