(S (S (S (BASENP (NNP Zahab)) (VP (VBD had) (S (VP (TO to) (VP (VP (VB pull) (NP (NP (ADJP (JJ 170-lb) (PRN (LRB -LRB-) (JJ 77-kg) (RRB -RRB-))) (NNS sleds)) (PP (IN of) (BASENP (NN equipment))))) (COMMA ,) (S (VP (VBG traveling) (PP (PP (IN on) (BASENP (NN foot))) (CC and) (PP (IN on) (BASENP (NNS snowshoes))))))))))) (SBAR (IN while) (S (BASENP (DT the) (JJ other) (NN two) (NNS men)) (VP (VBD skied))))) (PERIOD .))