Complex sentence: Courtenay was homosexual and became infamous for his affair with art collector William Beckford, who was hounded out of polite English society when his letters to Courtenay were intercepted by the boy's uncle, Lord Loughborough, who then advertised the affair in the newspapers.
Split into simpler sentences: Courtenay was homosexual and became infamous for his affair with art collector William Beckford. Beckford wwas subsequently hounded out of polite English society when his letters to Courtenay were intercepted by the boy's uncle, Lord Loughborough, who then advertised the affair in the newspapers.