Original: In the late 80s and early 90s he tarnished his left-wing credentials with a plea for pro-business policies and a call for the reduction of the influx of Germans from Eastern Europe and asylum-seekers.
Simplified: In the late 80s and early 90s he lost some support from left-wing people because he seemed to want pro-business policies and he called for a reduction of the influx of Germans from Eastern Europe and asylum-seekers.