original: 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.
simplifications: He was a leader in the German political party Alliance '90-The Greens. He also was the most popular politician in Germany during that time. As a leader in the German political party Alliance, he was the most popular politician in Germany at the time. He was an important person in the German political party Alliance '90 / The Greens. According to opinion polls, he was the most popular politician in Germany for most of the government's duration. He was a top person in the German political party Alliance '90 / The Greens. According to opinion polls, he was the most popular politician in Germany for most of the government. He was a leading figure in the German political party Alliance in the 90s and the most popular politician in Germany for most of the government's tenure. He was a leader in the German political party Alliance '90. He was the most popular politician in Germany while in government. He was a leading figure in the German political party Alliance '90. According to polls, he was the most popular politician in Germany for most of the government's duration. According to opinion polls, he was the most popular politician in Germany and a leading figure in the German Political party Alliance '90/ The Greens. He was the most popular politician from the The Green political party in Germany for most of the government's duration. He was a leading figure in the German political party Alliance ' 90/The Greens, and was the most popular politician in Germany for most of the period of the government, according to opinion polls.