Complex sentence: It was here in 1964 that Raymond Poulidor battled with Jacques Anquetil in one of the race's most famous moments, racing side by side up almost the entire climb, and that in 1975 Eddy Merckx was punched in the kidney by a spectator.
Split into simpler sentences: It was here in 1964 that Raymond Poulidor battled with Jacques Anquetil in one of the race's most famous moments, racing side by side up almost the entire climb. Also on this peak in 1975 Eddy Merckx was punched in the kidney by a spectator.