 To this end, we used data gathered by the CrowdSource team at Google Research in 2019 and  fine-tuned pre-trained BERT model on our problem.
<fluency>  To this end, we used data gathered by the CrowdSource team at Google Research in 2019 and  fine-tuned pre-trained BERT model on our problem.
 To this end, we used data gathered by the CrowdSource team at Google Research in 2019 and a fine-tuned pre-trained BERT model on our problem.