えきでしんぶんをかいます / I buy a newspaper at a station
えき
It means "station".
しんぶん
It means "newspaper ".
かいます
It means "buy".
しんぶんを かいます
It means "buy newspaper".
えきで
the particle "で" means "at, in". So, this means "at the station".
えきで しんぶんを かいます
This means "I buy a newspaper at a station".