54 Here καί (kai) has been translated as “so” to indicate the conclusion of the topic.
55 The mention of glorifying and praising God is the second note of praise in this section; see Luke 2:13–14.
56 Grk “just as [it] had been spoken to them.” This has been simplified in the English translation by making the prepositional phrase (“to them”) the subject of the passive verb. The closing remark just as they had been told notes a major theme of Luke 1–2 as he sought to reassure Theophilus: God does what he says he will do.

In other versions

And the shepherds returned, glorifying and praising God for all they had heard and seen, as it had been told them.

The shepherds returned, glorifying and praising God for all the things they had heard and seen, which were just as they had been told.

The shepherds returned, glorifying and praising God for all the things they had seen and heard, which were just as they had been told.

The shepherds went back to their flocks, glorifying and praising God for all they had heard and seen. It was just as the angel had told them.

And the shepherds returned, glorifying and praising God for all that they had heard and seen, just as it had been told to them.

And the shepherds returned, glorifying and praising God for all the things that they had heard and seen, as it was told unto them.

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