Simplify the following text for a Grade 5 native English-speaking person.
Original: The line is currently 49.2 km long with 35 stations ( 4 to be constructed by 2016 ) , the longest MRT line in Singapore and it operated by SMRT Corporation .
Simplified: The line is currently 49.2 km long with 35 stations ( 4 to be built by 2016 ) . It is the longest MRT line in Singapore and it is operated by SMRT Corporation .