They planned to ambush him while he was on his way to a wedding between the two families to cement their alliance , but a Keraite warned Temüjin beforehand and spoiled their plan .
PRON VERB PART VERB PRON SCONJ PRON VERB ADP PRON NOUN ADP DET NOUN ADP DET NUM NOUN PART VERB PRON NOUN , CCONJ DET PROPN VERB PROPN ADV CCONJ VERB PRON NOUN .