A polite way to express giving or doing something for someone.
Long explanation:
The grammar point 'Verb て + さしあげる' is used to express the action of giving or doing something for someone in a polite manner. It is mainly used when the speaker is offering or doing something for someone of higher social status or showing respect towards the person. To form this expression, you need to conjugate the verb into its て-form and attach さしあげる.