Complex sentence: The next year, he spent a period in Germany where he organised the delivery of a cargo of arms, which was shipped on board of the "Gwalarn", which beached at Locquirec in the night of the 8th and 9th of August 1939.
Split into simpler sentences: The next year, he spent a period in Germany where he organised the delivery of a batch of arms, which was shipped on board of the "Gwalarn". However the ship beached at Locquirec in the night of the 8th and 9th of August 1939.