Complex sentence: After graduating from the grammar school of Hawkshead near Windermere, Cumberland, Pearson began his career as a schoolmaster at Hawkshead before moving to Lincoln as undermaster of the Free Grammar School.
Split into simpler sentences: After graduating from the grammar school of Hawkshead near Windermere, Cumberland, Pearson began his career as a schoolmaster at Hawkshead. After which, moving to Lincoln as undermaster of the Free Grammar School.