Complex sentence: Plaquemine Lock was opened on April 9,1909 after 14 years of construction and was closed after 52 years of service in 1961 due to incresed river traffic and the demand for a larger lock, which opened thereafter in Port Allen.
Split into simpler sentences: Plaquemine Lock was opened on April 9,1909 after 14 years of construction. The lock was closed after 52 years of service in 1961 due to increased river traffic and the demand for a larger lock, which opened thereafter in Port Allen.