Complex sentence: Neumann addressed these concerns in a letter, containing five and nine year plans of expansion and growth, and by trapping employees in a contract which made them unable to quit, he ensured that the best animators in Germany stayed working for the DZF.
Split into simpler sentences: Neumann addressed these concerns in a letter, containing five and nine year plans of expansion and growth. In addition, he trapped employees in a contract which made them unable to quit, making sure the best animators in Germany worked for the DZF.