Form help - one field per row??

Is there no way for multiple small fields to appear on the same line? I'm wracking my head for what feels like a simple issue...

Building an entry form and want a section to look something like (ease of use).

Field A

[_____________________]



Field B                Field C

[________]         [_______]

-instead of-

Field A

[_____________________]

Field B

[________]

Field C

[________]

Any help or best practices would be great. Thank you.