Hi Ngozi_324,
Thanks for your question. I have a solution that can hopefully solve the problem you have without requiring the splitting of cells and that you can maintain the original data in your database.
First, highlight your data, click on the Data tab, then click Filter. This is assuming your data has column headers.
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Next, go to the column header which has the people who worked on the projects and click on the little carrot. Click on Text Filters then click on Contains.
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In the textbox on the right of "contains", type in the person you are trying to find.
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Your data should be filtered to the specific person you are trying to find.
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I hope this works for you. Let me know if it does, or if you have additional questions. Thanks.