Four years, the years that followed her marriage, suffice Lady

A text that has commented on another: Four years, the years that followed her marriage, suffice Lady Younghusband for her somewhat elaborate study, 'Marie Antoinette: Her Early Youth, 1770-1774'. The reader does not dream of jumping over Lady Y. to get at the owner of her ( marriage) till 1770-1774 at the end throws a new light on the four years.

It's abstruse:

1. I have consulted 3 dictionaries, and SUFFICE is not included as transitive; is it an old-fashioned word here? What does it mean here?

2.What does DREAM OF...OF HER mean? TILL is a conjunction here, and the numbers are the subject of the subordinate clause, but why does the writer say THROWS... YEARS?