Complex sentence: The gifts proved popular, so for Christmas, 1965, the company introduced its first building set for retail sale in Germany, in part, it has been claimed, to foster education and interest in technology and science among the young.
Split into simpler sentences: The gifts proved popular, so for Christmas 1965, the company introduced its first building set for retail sale in Germany. In part, it has been claimed to foster education and interest in technology and science among the young.