Actually, that is part of the Eucharistic Rite at every Mass, and always has been: the breaking of bread is begun after the sign of peace, and is accompanied by the recitation or the singing of the Agnus Dei.
At every Mass. Every day.
By the way, where do you get your information?
(If a person actually doesn't know what we Catholics do, nor what we believe, it would be more becoming, I think, to ask questions than to make statements about us.)
I've been to a Mass twice and watched it numerous times on the tv...There was no breaking of bread that I witnessed...And when you receive the cracker, it is not a portion of broken bread...