Complex sentence: The electric ray is known to be the most electro-sensitive of all zoological organisms and their eyes are situated on the top of their head, providing for poor vision which must be balanced by use of other senses, including the detection of electricity.
Split into simpler sentences: The electric ray is known to be the most electro-sensitive of all zoological organisms. Their eyes are situated on the top of their head, resulting in poor vision that must be balanced by use of other senses, including the detection of electricity.