Complex sentence: His grandfather August Johansson built one of the first cars in Stockholm and sold it to LM Ericson and his father, Evald Johansson, taught car mechanics at a school in Stockholm so it was natural that Rolf Mellde would work in the same field.
Split into simpler sentences: His grandfather August Johansson built one of the first cars in Stockholm and sold it to Lars Magnus Ericsson. His father, Evald Johansson, taught car mechanics at a school in Stockholm so it was natural that Rolf Mellde would work in the same field.