<prompt> Translate the following text to EnglishNi vigumu sana kuamua mafanikio ya kuunganishwa kwa sababu ni muhimu kulinganisha utendaji wa kampuni mpya na utendaji wa makampuni ya zamani.  <response>: And its hard work to determine the success of mergers, because you have to compare the performance of the new company against the projected performance of the previously independent companies. 