How to fix a run-on sentence

2 min read · Principle: One clause, one job

This sentence is trying to do something good. It has three true things to say and the honesty to say all of them. What it doesn't yet have is a decision about which one matters.

The sentence

The storm was getting closer and the sky turned a strange green colour and Dad said we should go inside but nobody moved because we wanted to keep watching it.

A composite — built from a pattern that appears on many students' pages, not quoted from any one of them.

The diagnosis

Count the clauses: the storm approaches, the sky changes, Dad speaks, nobody moves, everyone wants to watch. Five events, four joins, and every join is and or but or because — the connectives that ask the least of a writer. The sentence isn't wrong so much as unweighted: because every event arrives with the same force, none of them lands. A reader finishes it knowing what happened and not knowing what mattered.

Three moves

Move one — find the hinge. Somewhere in a run-on there is a turn, the moment the sentence is really about. Here it's the disobedience: Dad said go inside, and nobody moved. Everything before it is weather; everything after it is why. Mark the hinge before touching anything else.

The storm was getting closer and the sky turned a strange green colour. Dad said we should go inside, but nobody moved.

Move two — let the full stop do the work. A full stop before the hinge makes the reader pause exactly where the sentence turns. Notice the second sentence is now short — and after a longer sentence, a short one sounds like a held breath.

Move three — earn the last clause back. The cut explanation (because we wanted to keep watching it) was true, so it deserves a home — but as its own sentence, it can say more than the run-on let it say.

The after

The storm was getting closer, and the sky had turned a strange green. Dad said we should go inside. Nobody moved. Whatever was coming, we wanted to see it arrive.

Four sentences, same events, and now the shortest one — Nobody moved. — carries the most weight, which is where the weight belonged all along.

The principle

One clause, one job. A sentence can hold more than one clause, but every clause it holds should be doing distinct work — and the moment two clauses are simply queueing behind an and, one of them is asking for its own sentence. This isn't a rule against long sentences. It's a rule against unweighted ones.