How to change citation in Biblatex spbasic

[Wolfgang Engelmann]

I use for my literature biblatex (author year) citation style spbasic, 
processor biber.

I would like to change the citation in the text slightly.
Example:

S Daan, DGM Beersma (1984)
should be

Daan, Beersma (1984)

or Daan and Beersma (1984)

Can I obtain this in the Style options and what should be entered there?

If not, how would I change it in the citation style spbasic which was 
modified for LyX by Herbert Voss?

Wolfgang