Complex sentence: Huizen was before World War II site of a large transmitter.Where the Phohi-flat is currently located, their were 2 large antennas which made contact to Dutch-India.
Split into simpler sentences: Huizen was before World War II site of a large transmitter. On the site where the Phohi-flat is currently located, their were 2 large antennas which made contact to Dutch-India.