Boku-wa [[ [sono toppina kaiketuhoo-o teiansi-ta] seibisi]-ga imadewa moo Amerika no kaisya-de erakunattei-ru] no [pro] no habahiroi zituyoosei-ni imasaranagara kantansi-ta .
I-TOP  that preposterous solution-ACC propose-PAST engineer-NOM now already U.S . no company-in big.shot.be-PRES no  no wide.ranged applicability-at again marvel.at-PAST
I again marvel at the wide-range applicability of that (seemingly) preposterous solution, which the engineer, who is now a big shot in an American company, proposed.