In this task, we ask you to rewrite a sentence in simple English without changing its general meaning. Essentially, you want to make the sentence easier to read by using simpler words, utilizing more straightforward sentence structures, and omitting non-essential information etc.

Users roll the ball to position the on-screen pointer , using their thumb , fingers , or commonly the palm of the hand while using the fingertips to press the mouse buttons .
The user rolls the ball with the thumb , fingers or the palm of the hand to move a cursor .

Crowsnest Pass ( sometimes referred to as Crow 's Nest Pass , ) is a low mountain pass across the Continental Divide of the Canadian Rockies on the Alberta – British Columbia border .
Crowsnest Pass is a mountain pass in the Canadian Rockies between Alberta and British Columbia .

The Royal Institute of International Affairs , commonly known as Chatham House , is a not-for-profit and non-governmental organisation based in London whose mission is to analyse and promote the understanding of major international issues and current affairs .

Chatham House , also known as the Royal Institute of International Affairs , is a London think tank .