Complex sentence: It has over 1,000 on its payroll and has grown into one of Japan's premiere Internet businesses as well as most controversial companies because of its frequent use of acquisitions and stock swap mergers to achieve growth.
Split into simpler sentences: It has over 1,000 staff on its payroll and has grown into one of Japan's premiere Internet businesses. It is one of the most controversial Japanese companies because of its frequent use of acquisitions and stock swap mergers to achieve growth.