Bing Image Creator keeps ignoring part of my prompt

honestly part of it is luck. each run gives you a few images, so try the same prompt three or four times before rewriting it. one of the set often has both things in it even when the rest don't.

Give each thing its own position and its own look. Something like "on the left, a red bicycle leaning on a wall. on the right, a grey cat sitting on a step." Placement plus a distinct colour stops it merging them, and it seems to listen to that more than word order. Also cut the style adjectives while you're testing. The more descriptive words there are, the more likely the second subject gets dropped. Once both show up reliably, add the style back. If it still won't, there's a limit to how well it handles two separate subjects. Generate them separately and combine them in an editor.