Every year many elderly people die in traffic accidents.
Literal
Every-year traffic accident [by-で] die old-people [subject-が] many.
A compact structure: 亡くなる老人 ('elderly people who die') is a relative clause, 多い ('many') is the final predicate. Not a SVO sentence — the subject 老人 is modified by a verbal clause and then 多い asserts their abundance.