Simplify the following text for a Grade 3 native English-speaking person.
Original: One controversial incident during his tenure with the Munich Philharmonic was a protracted legal battle to oust principal trombonist Abbie Conant that lasted 12 years , with Conant ultimately prevailing .
Simplified: Conant thought it was because she was a woman that he did not want her . The argument lasted for 12 years .