Complex sentence: At the beginning of his career the younger brother of Karl-Heinz Rummenigge didn't have it easy as a player of the Bayern Munich star team--always being compared with his brother--captain of FC Bayern Munich and the German national team.
Split into simpler sentences: At the beginning of his career Michael Rummenigge did not have it easy as a player with the Bayern Munich star team. He was often compared to his older brother, Karl-Heinz Rummenigge, captain of FC Bayern Munich and the German national team.