Complex sentence: Tin can mass production was however not common until the beginning of the 20th century, partly because a hammer and chisel were needed to open cans until the invention of a can opener by an Englishman named Yates in 1855.
Split into simpler sentences: Tin can mass production was however not common until the beginning of the 20th century, partly because they were difficult to open until the can opener was invented. A hammer and chisel were needed to open cans until the invention of a can opener by an Englishman named Yates in 1855.