Complex sentence: The crater Fra Mauro and associated Fra Mauro formation of the Moon are named after him; they were visited by the Apollo 14 astronauts, Alan Shepard and Edgar Mitchell in February of 1971.
Split into simpler sentences: The crater Fra Mauro and associated Fra Mauro formation of the Moon are named after him. The formation was instead explored by astronauts, Alan Shepard and Edgar Mitchell of the Apollo 14 mission in February of 1971.