This is the 15924th most frequent Russian word.
простыми
"Простыми" means "simple" or "easy" (instrumental plural form).
The word "простыми" is instrumental plural of "простой," used here to describe the quality of the words (adjective in instrumental case).
Они решили объяснить всё простыми словами.
They decided to explain everything with simple words.
Here, "простыми" describes "шагами" (steps) in the instrumental plural form, indicating the method/steps taken.
Две простыми шагами он добрался до дома.
With two simple steps, he got home.
The word "простыми" is instrumental plural describing "решениями" (solutions), signifying their simplicity in characterizing complex issues.