Task: Text Simplification
Input (English): he was a leading figure in the german political party alliance ' 90 / the greens , and according to opinion polls , he was the most popular politician in germany for most of the government 's duration.
Output (English): he was a leading figure in the german political party alliance ' 90 / the greens , and according to opinion polls , he was the most popular politician in germany for most of the government 's rule.