First of all, I'm not a lawyer, these are my thoughts after reading the document.
Second, it's only 5 pages, read it yourself here: assets.publishing.service.gov.uk/media/641adca28fa8f547c68029f6/Summary_of_Phase_1_Decision.pdf
tl;dr: The CMA has two complaints about the merger, and both of them are pretty easy to deal with. Merger is a go.
The CMA [Competition and Markets Authority] states there are two theories that the merger will create a 'substantial lessening of competition'.
TOH1 – Foreclosure of hardware competitors through leveraging VMware’s position in server virtualisation software.
Non-legalese: After the merger, Broadcom would be able to weaken their competitors by impairing the certification of competitor's drivers.
TOH2 – Non-horizontal effects from commercially sensitive information sharing
Non-legalese: After the merger, the process by which VMware certifies their products gives them access to commercially sensitive information. Broadcom would have an unfair advantage with that information, as this is code from their competitor's hardware.
So that is it. Just those two items. This seems like not any kind of big deal. Broadcom can answer these concerns via published business process. Keep that data separate, make a policy that the data cannot be shared between entities, etc.
If this is all there is the merger is getting approved no problem.