Simple groups are fundamental concepts in mathematics.

I found a simple leaf on the ground.

The tree has many simple leaves.

The cats play in the garden.

I learned how to tie simple knots in my sailing class.

Simple pendulums are used to study the principles of oscillation.

I love eating simple fruits.

I need to practice adding simple fractions.

Simple meters are commonly used in music composition.

She enjoys the simple-lifeish lifestyle, with minimal possessions and a focus on experiences.