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来たから

because someone came

→ 来る
phrase Common #7,647
because someone came 来た means “came,” and から means “because” when it follows a clause. Depending on context, it can also mean “since someone came.” Do not confuse it with 来てから, meaning “after someone came” or “since someone came.”
JA: 友達が来たから、いっしょに昼ごはんを食べた。
EN: Because my friend came, we ate lunch together.

電話が来たから出てきた。

I got a call, so I stepped out.

俺が来たからには問題は既に解決したようなものだ。

Now that I'm here, you can consider the problem solved.

近くの町まで来たから―ふと会ってみようかとならうちへ寄ってくれ

Since you've come as far as the nearby town—if you suddenly feel like seeing me, come by my house.

— セントラル・ステーション (1998)

弁護士が来たから失礼

My lawyer’s here, so I have to go.

— ふたりのベロニカ (1991)

（奥寺）仕事でこっちまで来たから久しぶりに瀧くんの顔を見ておこうと思って

(Okudera) Since I was in the area for work, I thought I'd stop by and see Taki for the first time in a while.

— 君の名は。 (2016)

突然こんな所に来たから乱雑に見えるのさ

It only looks messy because you suddenly came to a place like this.

— ほんとうのピノッキオ (2019)

ちょうど来たから

Since I just got here.

— ザ・マン・フロム・アース (2007)

母が来たから話を聞いてきた。

My mother came by, so I went to hear what she had to say.