  We investigate three barred lenticular galaxies (NGC 2681, NGC 3945 and NGC
4371) which were previously reported to have complex central structures but
without a detailed structural analysis of these galaxies' high-resolution data.
We have therefore performed four- to six-component
(pseudo-)bulge/disk/bar/ring/point source) decompositions of the composite
(Hubble Space Telescope plus ground-based) surface brightness profiles. We find
that NGC 2681 hosts three bars, while NGC 3945 and NGC 4371 are double- and
single-barred galaxies, respectively, in agreement with past isophotal
analysis. We find that the bulges in these galaxies are compact, and have
S\'ersic indices of $n\sim 2.2 - 3.6$ and stellar masses of $M_{*}$ $\sim
0.28\times10^{10} - 1.1\times10^{10} M_{\sun}$. NGC 3945 and NGC 4371 have
intermediate-scale `pseudo-bulges' that are well described by a S\'ersic model
with low $n \la 0.5$ instead of an exponential ($n=1$) profile as done in the
past. We measure emission line fluxes enclosed within 9 different elliptical
apertures, finding that NGC 2681 has a LINER-type emission inside $R \sim
3\arcsec$, but the emission line due to star formation is significant when
aperture size is increased. In contrast, NGC 3945 and NGC 4371 have composite
(AGN plus star forming)- and LINER-type emissions inside and outside $R \sim
2\arcsec$, respectively. Our findings suggest that the three galaxies have
experienced a complex evolutionary path. The bulges appear to be consequences
of an earlier violent merging event while subsequent disk formation via gas
accretion and bar-driven perturbations may account for the build-up of
pseudo-bulges, bars, rings and point sources.
