Complex sentence: Larrieu started his career in his native France at Montpellier Hérault Sport Club, but finding it impossible to dislodge the experienced French international Bruno Martini, he decided to move on.
Split into simpler sentences: Larrieu started his career in his native France at Montpellier Hérault Sport Club. However he found it impossible to dislodge the experienced French international Bruno Martini so he decided to move on.