Complex sentence: Nellie also ends the social media project so they will not be able to flirt, but a talk with Toby Flenderson (Paul Lieberstein) reminds Nellie that Andy was not always the best boyfriend to Erin and Nellie has second thoughts.
Split into simpler sentences: Nellie also ends the social media project so they will not be able to flirt. However, a talk with Toby Flenderson (Paul Lieberstein) reminds Nellie that Andy was not the best boyfriend to Erin and Nellie has second thoughts.