Complex sentence: She made her acting debut in the short-lived television series "Get Real" (19992000) before starring in her breakthrough role of Mia Thermopolis in the successful Disney comedy "The Princess Diaries" (2001).
Split into simpler sentences: She made her acting debut in the short lived television series "Get Real" (19992000). Hathaway's breakthrough role came with the role of Mia Thermopolis in the successful Disney comedy "The Princess Diaries" (2001).