As an extreme example, you can ask, “Ok Google, who was president when Kevin Durant was drafted into the NBA and what team drafted him?” That’s the example Google gave us at I/O. However, you’ll probably use something more along the lines of “Ok Google, turn on the lights in the kitchen and turn off the lights in the bedroom.”
Keep in mind, whenever you use the “and” to differentiate between two commands, you must make sure each command you speak is complete. For example, you cannot say, “Hey Google, turn on the lights in the living room and in the bedroom,” since in the bedroom isn’t a complete command.
Now go forth and speak those multiple commands at once.