 The method was not able to utilize the available huge amount of  monolingual data because of the inability of  models to differentiate between the authentic and synthetic parallel data  .
<clarity>  The method was not able to utilize the available huge amount of  monolingual data because of the inability of  models to differentiate between the authentic and synthetic parallel data  .
 The method was not able to utilize the available huge amount of existing monolingual data because of the inability of models to differentiate between the authentic and synthetic parallel data .