Complex sentence: Streets of London is a song written by Ralph McTell released in 1974; his greatest success, it managed to reach number two in the UK singles chart, at one point selling 90,000 copies a day.
Split into simpler sentences: Streets of London is a song written by Ralph McTell. It was his greatest commercial success, reaching number two in the UK singles chart and, at one point, selling 90,000 copies a day.