What does the times 1|1 and 3|2 and 15|10 mean?


The number before the | is the base time each player has on their clock. The number after is the seconds added to a player's clock after they make a move.
https://support.chess.com/article/445-how-do-the-time-controls-work-in-live-chess

Time Controls - Everything You Wanted To Know...
https://www.chess.com/blog/RussBell/time-controls-everything-you-wanted-to-know