Complex sentence: Two systems that were captured in sizable numbers were the SOMUA MCG half-track artillery tractor, German designation "S307 (f)" and the 81 mm Brandt Mle 27/31 mortar, German designation "GrW 278 (f)".
Split into simpler sentences: Two systems that were captured in sizable numbers were the SOMUA MCG half-track artillery tractor and the 81 mm Brandt Mle 27/31 mortar. The SOMUA MCG was given the German designation "S307 (f)" and the mle 27/31 was given the designation "GrW 278 (f)".