He always overcomplicates things.

Don't overcomplicate the process.

The instructions for assembling the furniture were overcomplicated.

She tends to overcomplicate things.

Stop overcomplicating the situation.

The overcomplication of the project led to delays and confusion.

The overcomplications of the project caused delays.

The overcomplicators in the group always make simple tasks more difficult.

He is known as an overcomplicator.