Complex sentence: In 1973, he oversaw another entry on the UK Singles Chart when "Love On A Mountain Top" reached the Top 10, whilst the re-issued "Everlasting Love" went even higher in the UK the following year, achieving Top 20 status.
Split into simpler sentences: In 1973, he oversaw another entry in the UK Singles Chart when "Love On A Mountain Top" reached the Top 10. Whilst the re-issued "Everlasting Love" went even higher in the UK the following year, this time achieving Top 20 status.