Complex sentence: V5 was lost after a night-time launch from the catapult ship "Friesenland" in Brest; the fate of V4 and V6, which in 1944 were still assigned to the Test Center in Travemünde, is unclear.
Split into simpler sentences: V5 was lost after a night-time launch from the catapult ship "Friesenland" in Brest. The fate of V4 and V6, which in 1944 were still assigned to the Test Center in Travemünde, is unclear.