Simplify the following text for a Grade 7 native English-speaking person.
Original: More attempts to exhibit Komodo dragons were made , but the lifespan of these creatures was very short , averaging five years in the National Zoological Park .
Simplified: People continued to try to keep Komodo dragons in zoos , but the lives of these creatures was very short . The average life of a dragon in a zoo was five years in the National Zoological Park .