@David, Moderator posted:
The relative clause does not modify the verb phrase; it is not an adverbial. "Which" simply takes a verb phrase ("yelling at the mother") as its antecedent. Within the relative clause, "which" functions as a substantive. You can replace it with "his yelling at the mother": "his yelling at the mother escalated . . . ."
Hi David, it's been awhile since I've been on here. I've really been a lot more confident with my writing, so thank you. I do have a quick question about the above post. Would it still work if, instead of "He began yelling at the mother, which escalated into..." I used "He yelled at the mother, which escalated into..."