He 'was apprenticed to' a carpenter [=he became a carpenter's apprentice] at the age of 15.
a carpenter's 'apprentice' = an 'apprentice' to a carpenter
He 'apprenticed' with a master carpenter for two years.
(..) Cheer Is singing loud for all to hear." And one day, when buddy was old enough, I made him my own personal apprentice. I've never been in this room before. Well, I think it's time you start Your tinker training. Santa's sleigh. (..)2003 Elf