Simplify the following text for a Grade 5 native English-speaking person.
Original: London Underground tried to close the entire line in 1980 ; instead , a reduced service was implemented , along with Blake Hall tube station being closed on Sundays .
Simplified: London Underground tried to close the whole line in 1980 , but they were not able to . Instead , fewer trains were run on the line and they also closed Blake Hall tube station on Sundays .