Complex sentence: In 1965 he acquired his Master craftsman as a plumber and electrician and then he worked from 1965 to 1970 with his older brother Dietrich Werhand, who leads the family business which was founded by their father in 1939.
Split into simpler sentences: In 1965 he acquired his Master craftsman as a plumber and electrician. From 1965 to 1970, he worked with his older brother Dietrich Werhand, who leads the family business which was founded by their father in 1939.