Complex sentence: Born on Oslo's east side, the son of a welder, Fredriksen began as a trainee in a shipbrokering company, and is now the worlds largest tanker owner, with more than seventy oil tankers, and major interests in oil rigs and fish farming.
Split into simpler sentences: Born on Oslo's east side, the son of a welder, Fredriksen began as a trainee in a shipbrokering company. Since he and is now the worlds largest tanker owner, with more than seventy oil tankers, and major interests in oil rigs and fish farming.