Generally, a paragraph that contains many consecutive sentences all starting with the same word, won’t be a nice read. The words will feel repetitive and the text will lack flow. That’s obviously not great for readability. Worst case scenario: readers might get annoyed and leave your website. So, while an occurrence of three identical sentence starters may seem of little importance for SEO to you, keep in mind that serving your audience the best content you possibly can is the essence of a holistic SEO strategy.