Complex sentence: In the gold rush Dalgety continued with general business, enlarged his pastoral trade, sold merchandise to the diggers and bought much gold from them; in 1851-55 he made about £150,000 from his gold speculations alone.
Split into simpler sentences: In the gold rush, Dalgety continued with general business, enlarged his pastoral trade, sold merchandise to the diggers and bought much gold from them. Between 1851-55 he made about £150,000 from his gold speculations alone.