This is the beginning of a new part of the story. Luke gives important background information to understand the story. (See: [[rc://en/ta/man/translate/writing-background]])
These were Jews who had lived most of their lives somewhere in the Roman Empire outside of Israel, and had grown up speaking Greek. Their language and culture were somewhat different from those who had grown up in Israel.
This can be stated in active form. AT: "the Hebrew believers were overlooking the Grecian widows" (See: [[rc://en/ta/man/translate/figs-activepassive]])