、。
Sorry, thank you for waiting.
Literal
Sorry, honorific-wait-made [polite-しました].
お待たせしました is a standard polite phrase, built as the humble お+[verb stem]+する form of 待たせる 'make (someone) wait' — the causative of 待つ 'to wait.' The humble form is then conjugated into polite past: お待たせ+いたし/し+ました. A service-industry staple, spoken when approaching a customer after a wait. Short, but layered with keigo machinery.