Here’s a quick rule that you’ll be tempted to break often: don’t have two massive sentences in a row.
A fiction editor once told me that 20 words is already a long sentence. Two qualifications: “long” is not pythonesque; fiction is not academic writing.
In lieu of an example, a mathematical formula: 2x (where x means 50 or more) = pain for the reader.
All tips to date are available at:
http://www2.arnes.si/~bjason/LW%20tips.pdf
(Skupno 12 obiskov, današnjih obiskov 1)