Complex sentence: On May 3, Kropp bullied through thigh-deep snow; however, just 300 feet from the top, Kropp decided to turn around, believing that he would be too tired to descend safely if he went up further.
Split into simpler sentences: On May 3, Kropp bullied through thigh-deep snow and reached 300 feet of the summit. However, Kropp decided to turn around, believing that he would be too tired to descend safely if he went up further.