Complex sentence: Meanwhile the Tacoma Box Company had been floundering for twelve years, since the death of the plant's first manager, Joe Nist, when younger brother Eugene M. Nist (Gene) was sent to manage the Tacoma plant in 1938.
Split into simpler sentences: Meanwhile the Tacoma Box Company had been floundering for twelve years, since the death of the plant's first manager, Joe Nist. Younger brother Eugene M. Nist (Gene) was sent to manage the Tacoma plant in 1938.