Original sentence: By 1978 the three members had been replaced by Jacqui Smith-Lee, Theodosia 'Dodie' Draher and Ednah Holt.The song was essentially a medley of recent disco songs linked together with an original chorus  and it became a worldwide hit
Edited sentence: By 1978, the three members had been replaced by Jacqui Smith-Lee, Theodosia 'Dodie' Draher and Ednah Holt.The song was essentially a medley of recent disco songs linked together with an original chorus and it became a worldwide hit