TASK DEFINITION: In this task, you're given a sentence and your task is to generate a simplified sentence that focuses on lexical paraphrasing from the original sentence given in the input.
PROBLEM: they were built mainly by nations like germany during world war ii to protect important industries from aerial bombardment.

SOLUTION: they were built mainly by countries like germany during world war ii to protect important industries from attack by planes.

PROBLEM: 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.

SOLUTION: he was a main 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 time in power.

PROBLEM: these works he produced and published himself , whilst his much larger woodcuts were mostly commissioned work.

SOLUTION:
his much larger woodcuts were commissioned work and the rest he produced and published himself.