Is a defendant liable for multiple crimes committed during a course of conduct deemed to be indivisible in time?

"An act . . . that is punishable in different ways by different provisions of law shall be punished under the provision that provides for the longest potential term of imprisonment, but in no case shall the act or omission be punished under more than one provision." ( 654, subd. (a).) This prevents a defendant from being punished for multiple offenses that are committed during "a course of conduct deemed to be indivisible in time." (People v. Beamon (1973) 8 Cal.3d 625, 639.)