Complex sentence: By 1910, Trimble became Florence Turner's exclusive director and continued to make films with his lucky pet, Jean, until 1913, when Trimble, Turner, and Jean left Vitagraph and started up Turner Films, Ltd. in England.
Split into simpler sentences: By 1910, Trimble became Florence Turner's exclusive director and continued to make films with his lucky pet, Jean. In 1913, Trimble, Turner, and Jean left Vitagraph and started up Turner Films, Ltd. in England.