。
She brought a lot of luggage.
Literal
She [topic-は] luggage [object-を] a-lot carried came.
持ってきた is the past form of 持ってくる — the directional compound for motion toward the speaker's location, here meaning 'brought (here).' The contrast between ~ていく (away from speaker) and ~てくる (toward speaker) is fundamental in Japanese: every motion verb pairs with one or the other to encode the speaker's vantage point. 手荷物 (てにもつ) means 'hand luggage' — 手 (hand) + 荷物 (luggage), the carry-on counterpart to checked baggage.