Complex sentence: The wine was invented by Harold Borgman, the owner of Pontchartrain Wine Cellars in Detroit, in 1937 and based on a traditional German custom of mixing all the dregs of unfinished wine bottles with champagne.
Split into simpler sentences: The wine was invented by Harold Borgman, the owner of Pontchartrain Wine Cellars in Detroit, in 1937. The recipe was based on a traditional German custom of mixing all the dregs of unfinished wine bottles with champagne.