Complex sentence: In the 1930s Finland purchased Thornycroft torpedo boats from the United Kingdom, and also refrained from buying bomber aircraft from Germany because of British protests, purchasing instead modern Bristol Blenheims, which later served successfully during the Winter War.
Split into simpler sentences: In the 1930s Finland purchased Thornycroft torpedo boats from the United Kingdom. Finns also refrained from buying bombers from Germany because of British protests, purchasing instead modern Bristol Blenheims which later served successfully during the Winter War.