Complex sentence: Mozilla later confirmed that it registered 7.1 million "direct downloads" of Firefox 4 in 24 hours; the figure increased to over 10 million when taking into account users updating from the release candidate of Firefox 4.
Split into simpler sentences: Mozilla later confirmed that it registered 7.1 million "direct downloads" of Firefox 4 in 24 hours. The figure increased to over 10 million when taking into account users updating from the release candidate of Firefox 4.