People involved:

Sergey Brin, Google co-founder, Anne Wojcicki, wife of Sergey and founder of 23 and me, Amanda Rosenberg, marketing manager at Google, Hugo Barra, ex-executive at Google

Gist:

Sergey marries Anne Wojcicki, sister of one of their high level employees, and has 2 kids with her. She is close to 41 years old now.

Sergey starts to get good press coverage for some of the products he is working on. Has an affair with a young marketing manager, Amanda Rosenberg, age 25.

At this time Amanda is in a relationship with Hugo Barra who was the face was Nexus, the phone and tablets made by Google. Hugo thinks the relationship is solid and is planning to switch to a Chinese company for a bigger role and move to China.

Amanda Rosenberg keeps him in the dark while setting up a branch swing with Sergey and when the new branch is within reach makes the jump leaving behind Hugo.

August 28 Sergey and Anne announce their separation, Hugo Barra announces he is leaving Google to work for the Chinese company. Followed by this there are rumors of an affair between Sergey and Amanda.

TRP common knowledge observed: Rich husband finds a younger girl leaving behind an older wife and the young girl branch swings to a better and high status provider.

Link to the story

EDIT: Looks like Sergey has a prenuptial agreement in place. Lets see if this plays out over the next couple of years. Might end up being the biggest divorce settlement ever if they end up splitting 50-50. He is worth ~30 billion.