Complex sentence: The game began its life in 1992 as "Championship Manager"; however, following the break-up of their partnership with original publishers Eidos Interactive, Sports Interactive lost the naming rights and re-branded the game "Football Manager" with their new publishers Sega.
Split into simpler sentences: The game began its life in 1992 as "Championship Manager". However, following the break-up of their partnership with original publishers Eidos Interactive, Sports Interactive lost the naming rights and re-branded the game "Football Manager" with their new publishers Sega.