Complex sentence: In 1906 Theodor Kiepe created an electric arc lamp repair workshop in Düsseldorf, over the next 40 years the company's product range grew to include electrical switches, then electrical drum controllers and resistors for electric vehicles.
Split into simpler sentences: In 1906 Theodor Kiepe created an electric arc lamp repair workshop in Düsseldorf. Over the next 40 years the company's product range grew to include electrical switches, then electrical drum controllers and resistors for electric vehicles.