HELP! How to Delete lines in an image and merge visable image?

HI!

I have been dabling with coreldraw for a few months now, im using and creating vectors to cut out on a vinyl cutter, but sometimes i come accross an issue. the most frequent issue is i cant seem to merge THIS image on the right to what i see, yet when selected there are lines underneath that show, i need to get lines not to overlap like THIS because it chops up the vinyl.

Can someone please help? creating outlines work but the lines get pixelated or bend or curve even on lowest setting, and the 'simplify' does not seem to work.

thankyou