Tā mǎnhuái xióngxīnzhuàngzhì de chuàngbànle zìjǐ de gōngsī.
He founded his own company full of great ambition.
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雄心壮志 is a four-character idiom (成语) that combines 雄心 (great ambition) and 壮志 (magnificent aspiration). It's more literary than simply saying 野心 (ambition, which can have negative connotations).
