Complex sentence: They often observe many mortal events, considering them as entertainment, given their large numbers and ability to move around without attracting too much attention their abilities, especially in acquiring information, are greatly underestimated by most.
Split into simpler sentences: They often observe many mortal events, considering them as entertainment. Their large numbers and their ability to move around without attracting attention, their abilities, especially in acquiring information, are greatly underestimated by most.