Complex sentence: The stone (abbreviation "st" "Concise Oxford Dictionary", Oxford University Pres; 1964) is a unit of measure equal to 14 pounds avoirdupois (about 6.35 kg) used in Great Britain and Ireland for measuring human body weight.
Split into simpler sentences: The stone (abbreviation "st" "Concise Oxford Dictionary", Oxford University Pres; 1964) is a unit of measure equal to about 6.35 kg (14 pounds avoirdupois). It is used in Great Britain and Ireland for measuring human body weight.