Complex sentence: The mushikamado first came to the attention of the Americans after the Second World War when Air Force servicemen would bring them back from Japan in empty transport planes but it wasn't until the late 1960's that manufacturing started in the Americas.
Split into simpler sentences: The mushikamado first came to the attention of the Americans after World War II when Air Force servicemen would bring them back from Japan in empty transport planes. It wasn't until the late 1960s that manufacturing started in the Americas.