The Collaborative International Dictionary of English v.0.48:
Insomuch \In`so*much"\, adv.
So; to such a degree; in such wise; -- followed by that or
as, and formerly sometimes by both. Cf. Inasmuch.
Insomusch as that field is called . . . Aceldama.
--Acts i. 19.
Simonides was an excellent poet, insomuch that he made
his fortune by it. --L'Estrange.