When he had destroyed (kathelōn). Second aorist active participle of kathaireō, to tear down, old verb.
He gave them for an inheritance (kateklēronomēsen). First aorist active indicative of the double compound verb katȧklērȯnomeō, late verb in lxx (Numbers 34:18; Deuteronomy 3:28; Joshua 14:1) and only here in the N.T., to distribute by lot, to distribute as an inheritance. This is the correct reading and not kateklērodotēsen from kataklērodoteō of the Textus Receptus. These two verbs were confused in the MSS. of the lxx as well as here.
For about four hundred and fifty years (hōs etesin tetrakosiois kai pentēkonta). Associative instrumental case with an expression of time as in Act 8:11; Luk 8:29 (Robertson, Grammar, p. 527). The oldest MSS. (Aleph A B C Vg Sah Boh) place these figures before “after these things” and so in Act 13:19. This is the true reading and is in agreement with the notation in 1Ki 6:1. The difficulty found in the Textus Receptus (King James Version) thus disappears with the true text. The four hundred and fifty years runs therefore from the birth of Isaac to the actual conquest of Canaan and does not cover the period of the Judges. See note on Act 7:6.