そうして; そして
そうして; そして · soushite; soshite · JLPT N5 · noun
and
そう + して = so + doing: having done so, and then...
そうして is そう (so, like that) plus して, the te-form of する (to do): literally doing so. Having done that, the next thing follows, which gives the meaning and then. そして is the same word with the long う clipped short.