Complex sentence: He was transferred to a training job with the 27th U-boat Flotilla, spending five months there followed by a year in the 2nd ULD (U-boat training division) as tactical instructor for the officers.
Split into simpler sentences: He was transferred to a training job with the 27. Unterseebootsflottille, spending five months there followed by a year in the 2nd ULD (U-boat training division) as tactical instructor for the officers.