οἷον τοιόνδε λέγω: is a formula for introducing an example or a special case in illustration of a general statement.
εὖ ἔχειν τὰ σώματα: τὰ σώματα here, as well as τὸ σῶμα καὶ τὴν ψυχήν below, is acc. of specification. H. 718 a.
τὸ τοιοῦτον: the article is used on account of its reference to what has just been described. This is more definitely given in the ὅτι (relative) clause which follows.
ἔχει δὲ κτἑ.: in this change of subject lies no ambiguity either to the Greek mind or to us. It was, besides, a regular way in Greek of expressing “although.” The subject is the same indefinite one which must be supplied as the object of the preceding ποιεῖ. See on 456 d.