Complex sentence: Several of the company's later consoles were commercial failures, however, and the financial losses incurred from the Dreamcast console caused the company to restructure itself in 2001 and focus on providing software as a third-party video game developer, exiting mainstream console manufacturing completely.
Split into simpler sentences: Several of the company's later consoles were commercial failures, however, and the financial losses incurred from the Dreamcast console caused the company to restructure itself in 2001. Since then, Sega has focused on providing software as a third-party video game developer, exiting mainstream console manufacturing completely.