Complex sentence: She was a young girl then, but Robert was smitten, and when in 1936 her father came to Paris as the new Japanese Ambassador to France, bringing his daughter with him, Robert at once came to the embassy and offered to convert to Shintoism.
Split into simpler sentences: She was a young girl then, but Robert was smitten. In 1936, her father came to Paris as the new Japanese Ambassador to France, bringing his daughter with him, and Robert at once came to the embassy and offered to convert to Shintoism.