Complex sentence: Le défi de l'acier et les premières fusions ironclads and tunneling machines, in 1872 the company's first Siemens-Martin converter begins operation, and in 1886 begins to use the Thomas-Gilchrist process (basic process).
Split into simpler sentences: Le défi de l'acier et les premières fusions ironclads and tunneling machines. By 1872 the company's first Siemens-Martin converter begins operation, and in 1886 begins to use the Thomas-Gilchrist process (basic process).