1To come along/arrive here; an informal form of 'やって来る', often implying someone or something turning up.
友達が週末にやってくる予定だ。
A friend is scheduled to come over this weekend.
寒波がやってくる前に備えをしよう。
Let's prepare before the cold wave comes.
子どもたちが次々とやってくる。
Children keep arriving one after another.
2To arrive at the present state or position after a process; to have come to be (often used in constructions like '〜してやってくる').
若い頃から修行を重ね、やっと一人前の職人にやってくる。
After years of training since youth, one finally becomes a full-fledged craftsman.
あの店は小さな屋台から始まり、今では全国に支店を出してやってくる。
That shop started as a small stall and has now opened branches nationwide.