Sentence identification

Hi there,

I have put my answer on the end of each sentence. Could someone please confirm if i have identified the sentence correctly as either a 'Simple, compound or complex sentence? If incorrect, could you explain why?

Appreciate your help!

Even though the first homebuyers grant has been increased by $5000, new house sales have not risen over the last quarter.(complex sentence)

His excellent drawings and paintings, which were mostly produced in Sri Lanka, survive in the Natural History Museum.(complex sentence)

The strongest winds in tropical cyclones are near the eye; nevertheless, damaging winds can extend hundreds of kilometres from the centre. (compound sentence)

The 1967 federal referendum passed with a huge majority; in fact, at 90.2 per cent, it was the largest affirmative vote in the history of Australia's referendums.(compound sentence)

Physical aids for the disabled range from simple mechanical devices to the sophisticated and complex products of biomedical engineering. (complex sentence)

Although the public knew him better for his novels, his poetry received critical acclaim in both Australia and New Zealand.(compound sentence)

The lymphatic system plays a major role in the defence mechanisms of the body.(Simple Sentence)

An earthquake's epicentre can be located accurately if three or more seismographs detect the event.(Simple Sentence)

Wood was one of the earliest raw materials that served the purposes of the arts and crafts in antiquity.(Simple Sentence)

Fossil fuels are derived from long dead biological material; however, bio-fuels are derived from recently dead biological material.(compound sentence)

Thanks