1. 以天文物理闻名的史蒂芬灭N金，其出版的“时间简史(A Brief History of Time)”
是他最为人熟知的著作。
Stephen Hawking, who is well-known in astrophysics, published his most famous
work "A Brief History of Time".
2. 即使罹患罕见疾病，霍金仍靠着先进的医疗技术延续生命，并活到了76岁。
Though suffered from a rare disease, Hawking had still extended his live by ad
vanced medical technology and passed away until seventy-six years old.
以上翻译若有需再修正，欢迎各位指教，谢谢！

关于第1句，我原本以为后面会接出版时间，其他读者可能也会有这样的疑惑，或是觉得语句就莫名断掉了，但看中文是个完整的句子，不妨考虑把well-known留到讲他的出版品