Google Home has supported two stacked voice commands for a while, and now it increases this limit to three. Just cross your fingers and hope it works.
As discovered by the Android Police, Google deploys a smarter command recognition that can (in theory) handle up to three commands. Previously, the smart hub could handle two commands, but only if they were structured very carefully. For example, you could say, "Turn on the lights in the living room and turn on the lights in the kitchen," which is a terribly awkward way to express this request.
This new update adds some tweaks. For beginners (and most usefully), Google can more intelligently interpret your stacked orders. To continue the example above, you can now say "turn on the living room lights and kitchen lights." In my experience, Google had trouble with the drive if I did not specify "lights" for everyone, but I could go on the "turn on", which sounds more natural.
In addition, Google claims that its voice assistant speaker can support up to three commands at a time. It is possible that this feature is still being deployed, but in my first tests, I have not been able to get Google Home to recognize more than two. The problem could be that of the wording. Simplifying controls makes it easier to move Google (a machine may have more difficulty telling if "living room and kitchen" is two devices, or just a very long name for a single group of lights), so stacking three orders together increases the odds that Google will not be able to analyze it. That said, it is possible that Google's only rolling support for three orders is coming out slowly and it's not yet available for everyone.
Even though Google has not been successful at multitasking yet, this update is a solid improvement. When Google Home was launched, you had to issue each order individually, with an "Ok, Google" between each. Now, "Hey google, turn off the living room and set a timer for ten minutes" works great. Progress is progress.
By way of remark, I've also learned by testing that if you ask Google to control a smart home gadget that it does not recognize enough times, Google will now send you a notification on your phone prompting you to configure all the new gadgets you have, with a convenient link to the part of the Google Home app where you can do it. In this case, Google was simply misleading about my intention, but it's a good idea for users who do not have all the gadgets of their smart home configured correctly.