Complex sentence: The house of correction was a type of establshment built after the passing of the Elizabethan Poor Law (1601), places where those who were "unwilling to work", including vagrants and beggars, were set to work.
Split into simpler sentences: The House of Correction was a type of building built after the passing of the Elizabethan Poor Law (1601). Houses of correction were places where those who were "unwilling to work" including vagrants and beggars were set to work.