The phrase "was subject to" refers to a situation that occurs due to a particular issue, challenge, or condition. To convey similar meanings, synonyms such as "suffered from," "endured," "experienced," "underwent," "encountered," and "faced" can be used. These words highlight the fact that something negative or challenging happened to someone, and they had no control over it. Other synonyms that connote a sense of vulnerability include "fell prey to," "became susceptible to," "was vulnerable to," and "was at risk of." By using these synonyms, a writer can effectively convey the same sense of helplessness and vulnerability without using the same phrasing repeatedly.