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Not all philosophers are good writers. But both Bertrand Russell and David Hume are clear writers and excellent stylists.
However, I do not recommend Russell's A History of Western Philosophy. Russell is a great philosopher, but he is no intellectual historian. Instead, I recommend his (1912) The Problems of Philosophy. It is a nice introduction to the central problems of modern Western philosophy, which is still widely read by beginning philosophy students at the college and graduate level.
Also, life is too short to read history books about philisophy. It is better to read the philosophical classics themselves. I second the recommendation to read some of Plato's dialogues: especially The Apology of Socrates, The Symposium, and at least the first two books of The Republic (Robin Waterfield's translations into English are good, and very readable).
Then you can try reading some early modern philosophy classics, like Descartes's Meditations on First Philosophy, Berkeley's Three Dialogues between Hylas and Philonous, and two books by Hume: An Enquiry Concerning Human Understanding, and Dialogues Concerning Natural Religion.
Go to that website, and you will find PDF documents of the texts I mentioned (not Plato, but Descartes, Berkeley, Hume and others), edited and abridged for easy reading with commentary explaining difficult terms.