Complex sentence: EL1 replaced the previous 369 bus service and operates 24 hours a day between Thames View Estate and Ilford, until recently when EL1 was extended from Thames View Estate to Barking Riverside.
Split into simpler sentences: EL1 replaced the previous 369 bus service and operated 24 hours a day between Thames View Estate and Ilford. EL1 has been extended from Thames View Estate to Barking Riverside.