Sometimes, good writers make their writing more interesting by joining sentences that are short and choppy.
Sentences that have ideas that go together can be joined with a comma (,) and the word and, but, or or.
Be sure the connecting word makes the meaning of the combined sentences clear.
Randy may draw a picture of an elephant. He may draw a lion instead.
Randy may draw a picture of an elephant, or he may draw a lion instead.
The hill was steep. I grew tired of climbing it.
The hill was steep, and I grew tired of climbing it.
The team was short one player. They won the game.
The team was short one player, but they won the game.