You are given a sentence and your task is to generate another sentence that supports the given input.

Complex machines are merely combinations of two or more simple machines.
A complex machine is described by: it is made of more than one simple machine.

Stages of Adulthood Although chronological age may be used to describe the three stages of adulthood, chronological age is not always relevant.
Adulthood is divided into three stages.

pH pH is a measure of the hydrogen ion concentration in water.

The concentration of the hydrogen ion in a solution can be calculated when the ph is known.