Complex sentence: In Erfurt at age 25, Sophie published her first book of poetry and plays, and have her first performance as an actress in an amatuer production of Weisse's Romeo and Juliet.
Split into simpler sentences: In Erfurt at age 25, Sophie published her first book of poetry and plays. She also had her first performance as an actress in an amatuer production of Weisse's Romeo and Juliet.