As a non-native speaker, another tip I remember reading somewhere and then finding it very useful: when you read a packed sentence that doesn't seem super clear and the next sentence starts with "Indeed, ..." that means you should read further as it will be a kind of explanation or elaboration. I mostly filtered out such words as "filler" or generic "emphasis words", but they guide the understanding also.
Good mathematical writing has this kind of cadence and pattern to it, and that's not a problem. For good writers some personal charm and flavor can still shine through, but it helps the reader to use the familiar trope structures. Unfortunately, this kind of "meta" is not taught much, so many students don't quite understand how to read math books, get frustrated when they progress slow, expecting to read it at the same speed as a history book or a novel. In a math book it's normal to re-read sentences or jump back half a page, to flip the pages back and forth, to put down the book for a moment and think etc. and it may take an afternoon to just digest one or two pages.
replies(1):