Complex sentence: He was also a member of Minerva's rowing association, KSRV Njord, and represented the Netherlands at the at the 1936 Summer Olympics in Berlin, paired with Karel Hardeman and joined by Johan Frans Van Walsem as coxswain.
Split into simpler sentences: He was also a member of Minerva's rowing association, KSRV Njord. He represented the Netherlands at the at the 1936 Summer Olympics in Berlin, paired with Karel Hardeman and joined by Johan Frans Van Walsem as coxswain.