There are a multitude of synonyms for the phrase "took part in". These include participated in, engaged in, joined in, got involved in, and played a role in. Other synonyms include had a stake in, had a hand in, collaborated on, contributed to, and helped support. These various phrases convey different nuances and levels of involvement, from actively participating to simply playing a supporting role in an event or activity. Using synonyms for "took part in" in your writing can help to vary your sentence structure and make your language more precise and engaging.