Which meaning, (1) or (2), can the following sentence be taken to mean?

"He has served the Colonel for five years as a jockey, and seven as a trainer."

(1) He has served the Colonel for a total of twelve years, five as a jockey, and seven as a trainer.

(2) He has served the Colonel for seven years as a trainer, including five years as a jockey.

Can the years (i.e. the lengths of time indicated by the duration adverbials) be taken either as overlapping (i.e.concurrent) or consecutive?

"He has served the Colonel for five years as a jockey, and seven as a trainer."

(1) He has served the Colonel for a total of twelve years, five as a jockey, and seven as a trainer.

(2) He has served the Colonel for seven years as a trainer, including five years as a jockey.

Can the years (i.e. the lengths of time indicated by the duration adverbials) be taken either as overlapping (i.e.concurrent) or consecutive?

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