We start sending offers with two texts, to give a little more space for the "Here's how you respond" info at the bottom. The two texts contain 1/2 and 2/2, to avoid any confusion should texts be received out of order.
Eventually, CrewDriver switches to sending the entire offer in one text. You can control this in Settings under Offers, if you want to send offers with one or two texts.
Also, you can max out the character count on every work offer. There's a character count in the offer preview shows you how many characters you have remaining for the offer and confirmation texts. So you can do things like use shorter versions of the call name if you need to claw back a few more characters.
There's one other place you'll see a two text offer and that's on the multi-day work offers.