Complex sentence: Physicist Stephen Hawking, Russian tycoon Yuri Milner, and others created the "Initiatives" to search for intelligent extraterrestrial life in the Universe and consider a plan for transmitting messages out into space.
Split into simpler sentences: Physicist Stephen Hawking, Russian tycoon Yuri Milner, and others. The "Initiatives" were created to search for intelligent extraterrestrial life in the Universe and consider a plan for transmitting messages out into space.