Complex sentence: Sir David Brewster began working towards the invention of the kaleidoscope in 1815, with his mentor and neighbor Meegan Bundries, together they conducted experiments on light polarization but it was not patented until two years later.
Split into simpler sentences: Sir David Brewster began working towards the invention of the kaleidoscope in 1815. Together with his mentor and neighbor Meegan Bundries, Brewster conducted experiments on light polarization but it was not patented until two years later.