Why were some words omitted in Luke 18: 24 in Catholic editions of NT?

We see different kinds of presentation of Luke 18: 23-24 concerning the rich man wanting to enter the Kingdom of Heaven. For instance we read .... " But when he heard this, he became sad; for he was very rich. Jesus looked at him and said, “How hard it is for those who have wealth to enter the kingdom of God!" (NRSVCE) " When he heard this he became very sorrowful, for he was very rich. When Jesus saw that he became very sorrowful, He said, “How hard it is for those who have riches to enter the kingdom of God!" ( Modern English Version) I wish to know what the content of Verse 24 available in the original was, and why the words 'when Jesus saw that he became very sorrowful' were omitted in the NRSVCE .