Complex sentence: Starting in the mid- 1990s it became more common to build database applications with a Web interface to run on a user's PC, the user would use the same Web browser program for every application.
Split into simpler sentences: Starting in the mid- 1990s it became more common to build database applications with a Web interface. Rather than develop custom software to run on a user's PC, the user would use the same Web browser program for every application.