Complex sentence: This is the motivation for the universal application of the Transverse Mercator projection in which the formulae of the normal Mercator projection are applied "treating some meridian as an equator": the result is a highly accurate map in a narrow strip near that meridian.
Split into simpler sentences: This is the motivation for the universal application of the Transverse Mercator projection. For this we adapt the formulae of the normal Mercator projection "treating some meridian as an equator": the result is a highly accurate map in a narrow strip near that meridian.