Complex sentence: Under the Harrisons, the newspaper knew little technical change yet testing times as the island was occupied by armed German forces from 1940 to 1945; although it was still published, the "Post" was strictly supervised and censored by the occupying forces.
Split into simpler sentences: Under the Harrisons, the newspaper, while undergoing little technical change, saw testing times as the island came under German military occupation from 1940 to 1945. Although it was still published during these years, the "Post" was strictly supervised and censored by the occupying forces.