Can you please explain what this paragraph means from the material section of a research paper?

First, the normal Shapiro-Wilk and Anderson-Darling Goodness-of-Fit Test was used to test the normal distribution of all data. Then, normal distributed data were analyzed utilizing various concentrations of the antimicrobial solution as a continuous variable (a covariate) in the analysis of covariance (ANCOVA) with individual factors of bacterial species and antimicrobial concentrations and their interactions (= 0.05), also confirmed by the factorial ANOVA test. For non-linear un-normal distributed data from cross-contamination test, the quadratic and cubic fit models was used to examine the fit of the data, followed by the factorial ANOVA test in quadratic and cubic models with individual factors and their interactions, finally, the ANOVA using concentrations as categorical ordinal was used to conduct pare-wise comparison expressed as LsMeans value with significant level of = 0.05.