ὅσον ἀπὸ τοῦ ἱεροῦ ἐφεωρᾶτο τῆς νήσου → as much of the island as was in view from the temple
third person singular present indicative active of a derivative of a compound of λύσις and τέλος; impersonally, it answers the purpose, i.e. is advantageous: it is better.
it profits