Complex sentence: The Mars Automatic Pistol is famous for using a peculiar collection of 8.5 mm, 9 mm and.45 calibres with bottle shaped cartridges that had a heavy powder loading, making the.45 version the most powerful handgun in the world for a time.
Split into simpler sentences: The Mars Automatic Pistol is famous for being available in a variety of 8.5 mm, 9 mm and.45 calibres. These were all bottle shaped cartridges with a heavy powder loading, making the.45 version the most powerful handgun in the world for a time.