Complex sentence: Having started participating in theatre while in still college, he started his acting career with Gujarati theater in the city from 1984 to 1992, and made his film debut with a role in "Mann" in 1999.
Split into simpler sentences: Having started participating in theatre while in still college, he started his acting career with Gujarati theater in the city from 1984 to 1992. And made his film debut with a role in "Mann" in 1999.