Complex sentences

What is a complex sentence

Walt: understand what is a complex sentence.

blurb for this week we had to work on our complex sentence slide stick it on a google doc.
what was a challenge the biggest challenge was when we had to write complex sentences  

My little sister is so irritating which makes me very mad especially because she is always happy doing it to me. 

The dolphin jumped up from the water. Its shining tail flicked crystal clear water to the sky while its body shone in the bright warm sun.

Tim Peake is a famous British astronaut who eats chips in space.

The house on the hill remained unsold But who had he seen sneaking around the house.

The lion's magnificent brown fur lay on the 

floor, as it's brown eyes, glared forward.

The enormous creature's teeth were as sharp as dangers and it's skin as green as grass, its eyes were pure yellow and it's reflection filled the car window.

He had been just playing with his friends until he saw a bright he followed it carelessly when he arrived a dark craft started sucking him up. 

As her body touched the crystal clear water it felt she was in an iceberg her shivering body made it clear that the water was too cold.

When the shining light echoes throughout the cave reflects magnificently and purely through the crystal clear waves it leads the small and extraordinary fish to freedom

Although he had broken the world record he was determined to persevere and break more records.

Although science is an interesting subject it can also be very dangerous