The word "behold" alerts us to a new person in the story. Your language may have a way of doing this. (See: [[rc://en/ta/man/jit/writing-participants]])
This was a title for the queens of Ethiopia. It is similar to the way the word Pharaoh was used for the kings of Egypt. (See: [[rc://en/ta/man/jit/translate-names]])
This implies that he was a Gentile who believed in God and had come to worship at the Jewish temple. Alternate translation: "He had come to worship God at the temple in Jerusalem" (See: [[rc://en/ta/man/jit/figs-explicit]])