One way to combine sentences for more variety is to use participial
phrases. To create a participial phrase from two sentences
that have the same subject, you take the verb of one sentence
(along with its direct or indirect object or complement),
make it into its participial form ( ending in -ing or -ed),
and add it to the other sentence.
Here are the steps. You have two sentences:
Jasper swung the broadsword. Jasper ran
at the dragon.
In these sentences, the subject is the same. Take the verb
of the first sentence ("swung"), along with its
direct object ("the broadsword") and change the
verb into its participial form with -ing: "Swinging the
broadsword." Now add it to the beginning of the second
sentence:
Swinging the broadsword, Jasper ran at
the dragon.
You could write this a number of ways:
Jasper, swinging the broadsword, ran at
the dragon.
Jasper ran at the dragon, swinging the
broadsword.
There are many different ways to use participial phrases. This
is just one of them.
It is important to place the participial phrase as close as
possible to the noun it modifies, though. Otherwise, you will
confuse your reader. People do this all the time and don't even
notice they are doing it, so be careful:
Striking midnight, Emily noticed the clock.
In this sentence, it sounds as if Emily is making the noise,
not the clock. Beware of dangling modifiers!
You can also use the past participle form to combine sentences,
when the participle describes the subject.
Wendell was disgusted. Wendell forced himself to eat his
breakfast.
Disgusted, Wendell forced himself to eat his breakfast.