ὅσον ἀπὸ τοῦ ἱεροῦ ἐφεωρᾶτο τῆς νήσου → as much of the island as was in view from the temple
πεφνέμεν: эп. inf. = * πεφνεῖν.
πεφνέμεν ep. inf. aor. act. van θείνω.