3. Jason realized he was watching too much television. He cut back to only one hour a day.
The most effective way to combine these sentences would be:
a. Jason realized he was watching too much television, and he cut back to only one hour a day.
b. Jason realized he was watching too much television, but he cut back to only one hour a day.
c. Jason realized he was watching too much television, so he cut back to only one hour a day.