Complex sentence: The person or company filing the application is referred to as the athat must provide sufficient detail for a person skilled in the art (i.e., the relevant area of technology) to make and use the invention.
Split into simpler sentences: The person or company filing the application is referred to as "the applicant". The application contains a description of how to make and use the invention that must provide sufficient detail for a person skilled in the art (i.e., the relevant area of technology) to make and use the invention.