Signal splitters.

Hi y’all, bit of a weird one but I’m interested in signal splitting just one pedal on my board and then having both signals go into the next pedal, so I can have both the effect tone and the other tone simultaneousl (all of my pedals are mono) was wondering if there was an easy way to do this, if passive splitters or designated pedals exist for this purpose, or anything else I should know! Thank you!