Complex sentence: A second Needle Tower was completed in 1968, Needle Tower II, and was acquired by the Kröller-Müller Museum in 1971, the piece resides in the museum's sculpture garden.
Split into simpler sentences: A second Needle Tower, Needle Tower II, was completed in 1968 and was acquired by the Kröller-Müller Museum in 1971. The piece resides in the museum's sculpture garden.