Complex sentence: ArsDigita was a web development company founded by Philip Greenspun which started in Boston, Massachusetts in the mid- 1990s, produced a popular toolkit (the ACS) for building database-backed community websites, and flourished at the peak of the Internet bubble.
Split into simpler sentences: ArsDigita was a web development company founded by Philip Greenspun which started in Boston, Massachusetts in the mid- 1990s. The company produced a popular toolkit (the ACS) for building database-backed community websites, and flourished at the peak of the Internet bubble.