。
The clan charges wildly, like a raging sea storm.
Literal
Rage-go-mad sea [possessive-の] storm [like-のように] clan [subject-が] fiercely runs.
Strongly literary. 猛り狂う ('to rage in fury') is a compound verb from 猛る ('to be fierce') + 狂う ('to go mad'), used attributively to modify 嵐 — 'a raging-mad storm.' ~のように ('like, as if') is the standard similative frame. 一族 ('clan, family lineage') is elevated vocabulary, typical of historical novels or samurai drama.