Complex sentence: In 2013, credit card processing company Square began integrating TUF with the open-source file-server RubyGems in an effort to prevent a repeat of that year's hack of RubyGems.org, which interrupted the widely used Heroku cloud application architecture.
Split into simpler sentences: In 2013, credit card processing company Square began integrating TUF with the open-source file-server RubyGems. The company took this step in an effort to prevent a repeat of that year's hack of RubyGems.org, which interrupted the widely used Heroku cloud application architecture.